Pack skimpy garment to cover middle of torso (6)
I believe the answer is:
throng
'pack' is the definition.
('throng' can be a synonym of 'pack')
'skimpy garment to cover middle of torso' is the wordplay.
'skimpy garment' becomes 'thong' (I've seen this before).
'to cover' indicates putting letters inside.
'middle of' indicates the central letters.
The central letter of 'torso' is 'r'.
'thong' enclosing 'r' is 'THRONG'.
(Other definitions for throng that I've seen before include "A great crowd of people" , "Troop" , "Come in great numbers" , "Large numbers" , "Milling crowd" .)