Develop and go round topless (6)
I believe the answer is:
evolve
'develop' is the definition.
('evolve' can be a synonym of 'develop')
'go round topless' is the wordplay.
'go round' becomes 'revolve' (I've seen this before).
'topless' means to remove the first letter.
'revolve' with its first letter removed is 'EVOLVE'.
'and' is the link.
(Other definitions for evolve that I've seen before include "Develop gradually over a long time" , "Cartoon sailor" , "Develop or change very gradually (6)" , "Gradually develop as Darwin predicted" , "Reveal a secret" .)