Body temperature, thereabouts (5)
I believe the answer is:
torso
'body' is the definition.
(a person's middle)
'temperature thereabouts' is the wordplay.
'temperature' becomes 't' (abbreviation).
'thereabouts' becomes 'or so' (I've seen this in another clue).
't'+'orso'='TORSO'
(Other definitions for torso that I've seen before include "Body without head, neck and limbs" , "Roots (anag)" , "unfinished work" , "part of body will be found" , "Trunk, something unfinished" .)