Bawdy drunken laird holding back, at first (6)
I believe the answer is:
ribald
'bawdy' is the definition.
('ribald' can be a synonym of 'bawdy')
'drunken laird holding back at first' is the wordplay.
'drunken' indicates an anagram.
'holding' indicates putting letters inside.
'at first' indicates taking the first letters.
The first letter of 'back' is 'b'.
'laird' is an anagram of 'riald'.
'riald' enclosing 'b' is 'RIBALD'.
(Other definitions for ribald that I've seen before include "Funny, but not nice" , "Mean" , "Coarsely humorous; scurrilous" , "Obscene" , "Humorously vulgar" .)