One must yield to Madame in drag bar (7)
I believe the answer is:
trammel
'bar' is the definition.
(I've seen this before)
'one must yield to madame in drag' is the wordplay.
I cannot quite see how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is found within 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 trammel that I've seen before include "Three-layered fishing net - melt ram (anag)" , "Limit, hamper" , "Hamper, as drag-net does" , "Hinder - impede" , "Place limits on" .)