Worry about American soldier returning hot goods (7)
I believe the answer is:
freight
'goods' is the definition.
(freight is a kind of goods)
'worry about american soldier returning hot' is the wordplay.
'worry' becomes 'fret' (fretting is a kind of worrying**).
'about' means one lot of letters goes inside another.
'american soldier' becomes 'gi'.
'returning' says the letters should be written backwards.
'hot' becomes 'h'.
'gi' back-to-front is 'ig'.
'ig'+'h'='igh'
'fret' going around 'igh' is 'FREIGHT'.
(Other definitions for freight that I've seen before include "Goods carried by a large vehicle" , "Transport of bulk goods" , "that's carried by rail and road" , "Charge for carrying" , "Goods carries by large vehicle" .)