Kid a communist it's a dance (7)
I believe the answer is:
'a dance' is the definition.
(I've seen this before)
'kid a communist' is the wordplay.
'kid' becomes 'fox' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a communist' becomes 'trot' (short for Trotskyist).
'fox'+'trot'='FOXTROT'
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for foxtrot that I've seen before include "Ballroom dance in quadruple time" , "Lively ballroom dance" .)