Brief squat (5)
I believe the answer is:
short
I believe this clue is a double definition.
'brief' is the first definition.
('short' can be a synonym of 'brief')
'squat' is the second definition.
('short' can be similar in meaning to 'squat')
(Other definitions for short that I've seen before include "Not long enough" , "Literary genre such as those by ..." , "Having little length" , "Limited in duration" , "Uncivil, brief film" .)