Body temperature (roughly) (5)
I believe the answer is:
torso
'body' is the definition.
(a person's middle)
'temperature roughly' is the wordplay.
'temperature' becomes 't' (abbreviation).
'roughly' becomes 'or so' ('10 or so' can mean 'roughly 10').
't'+'orso'='TORSO'
(Other definitions for torso that I've seen before include "Chest" , "Body without head, neck and limbs" , "Roost (anag)" , "Roost on trunk?" , "part of body will be found" .)