Relaxed Bluth's breaking record (4)
I believe the answer is:
limp
'relaxed' is the definition.
(thesaurus)
'bluth's breaking record' is the wordplay.
'bluth's' becomes 'im' (where the crossword setter is 'Bluth').
'breaking' is an insertion indicator.
'record' becomes 'L-P' (abbreviation for long play record).
'im' inserted within 'lp' is 'LIMP'.
(Other definitions for limp that I've seen before include "exhausted" , "Floppy" , "Not stiff or firm" , "Hanging loosely - hobble" , "Saggy and drooping" .)