Be inferior to what naturists do (4,7,2)
I believe the answer is:
have nothing on
'naturists do' is the definition.
The definition suggests a verb in its base form which matches the answer.
'be inferior to' is the wordplay.
I cannot really understand how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'what' acts as a link.
Can you help me to learn more?
(Other definitions for have nothing on that I've seen before include "being out of gear?" , "Lack engagement" , "barely?" , "like Gypsy Rose Lee ultimately" , "Be uncommitted" .)