Insect's middle (6)
I believe the answer is:
thorax
'insect's middle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for thorax that I've seen before include "Trunk between neck and abdomen" , "Upper part of body" , "Between the neck and belly" , "Upper part of the trunk" , "Insect's upper body" .)