[Fluffy]

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As south you raise yourself to game due to the suposed double fit with diamonds (wrong) and your club short where opponent's probably have many honnors (right).

LHO leads ♣6, RHO wins ♣A and returns ♣5, you ruff and LHO plays ♣2.

Tips for intermediates:

Spoiler

Time to decude: LHO has lead third from 4 card suit, so clubs are 4-6. Another important thing, RHO has ♣AQ, and LHO ♣K, why? because with KQ LHO would lead the king, and with AK RHO would hardly play Ace and small.
LHO has more vacant spaces, playing ♥K makes sense, trying to pin RHO's singleton 10, but it won't matter much on this deal:

After tackling trumps you will see that RHO has ♥Q10x and LHO singleton (pitches a club)

What next?

More tips for intermediates:

Spoiler

its easy to realice that diamonds can be a frozen suit if RHO has Hx or Hxx. Also spades is a frozen suit if RHO has 10x or 9x, also unplayable if he has Kx. And a ruff and discard is something wellcome as well. So it is time to play a third trump to endplay east.

LHO pitches ♦5 while RHO wins. he plays ♦Q back.

With all the deductions made so far, making the best play next shouldn't be hard.