I'm having fun with large disc (5)

I believe the answer is:

wheel

I'm a little stuck... Click here to teach me more about this clue!

'disc' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for wheel that I've seen before include "ring" , "Rotary object - don't reinvent it" , "Ferris -; Catherine -" , "No need to re-invent it!" , "Circular frame - old instrument of torture" .)

I've seen this clue in The Telegraph.

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