Be free to be a nudist (4,7,2)
I believe the answer is:
have nothing on
'be free' is the definition.
(I've seen this before)
'to be a nudist' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'to be' could be 'go' (going is a kind of being) and 'go' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for have nothing on that I've seen before include "Be uncommitted" , "barely?" , "being out of gear?" , "Lack engagement" , "like Gypsy Rose Lee ultimately" .)