Trunk's sort of square, give or take (5)
I believe the answer is:
torso
'trunk's' is the definition.
(both can mean a person's chest)
'sort of square give or take' is the wordplay.
'sort of square' becomes 'T' (a T-Square is a technical drawing instrument).
'give or take' becomes 'or so' (both can mean 'roughly' or 'approximately').
't'+'orso'='TORSO'
(Other definitions for torso that I've seen before include "Body, minus its head and limbs" , "Roots (anag)" , "Main part of human body" , "Trunk; headless, limbless body" , "upper body" .)