Used to complete minute revolution (6,4)
I believe the answer is:
second hand
'used' is the definition.
(I've seen this before)
'complete minute revolution' is the wordplay.
I cannot quite see how this works, but
'minute' could be 'second' (synonyms) and 'second' is present in the answer.
The remaining letters 'hand' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for second hand that I've seen before include "Watch component" , "Pointer on dial" , "being employed again" , "Part of a timepiece" , "Not new - part of watch!" .)