So when did the LibDems become so overtly tory? Was it all Clegg's doing?
You're collapsing parties into a single dimension with your analogy, that of economic policies. Anyhow, a short history for those who don't know (not meaning you) of how Lib Dems got here...
- In 1981 the SDP (Social Democratic Party) split from Labour in pursuit of more centrist than left wing economic policies based on European (German mostly) models.
- In 1988 they joined forces with the Liberal Party (old party, since the 1850s) to form the Liberal Democrats
- In 1994 Tony Blair won the Labour leadership contest and launched the New Labour era, lasting until 2010
In the two-decade spanning period of Blair's reign, the "Social Democratic" vote slowly but surely returned to Labour. The remaining core of the Lib Dems, the ones not drawn to Labour, were in essence neoliberals. Believing in a small state, free market, internationalism and deregulation. Economic policy wise, they are not that different from the Tories. But obviously not the party of "law and order" and conservatism, since they are believers in more freedom for the citizens and internationalism.
So to answer your question, it wasn't Nick Clegg. It was a process that started with Blair and New Labour, which affected the Lib Dems, the result of which was Clegg. He was the product of this transition rather than the cause.
With Labour veering to the left under Corbyn there's scope for Lib Dems to become more like Social Democrats and less Neoliberals. But that process takes years and requires new candidates to come through the party ranks. It was a 20-year transition to get here and we're only 4 years into the vacated centrist ground.
EDIT: In an ideal world there would be a genuine Social Democratic party in the UK. Like there is in most European nations. But the FTPT system and the make up of the UK, with the existence of nation-specific parties (SNP, Plaid Cymru, DUP, Sinn Fein) barely allows for 3 national parties. Never mind 4.