Company hurts trainers (7)
I believe the answer is:
coaches
'trainers' is the definition.
(coach is a kind of trainer)
'company hurts' is the wordplay.
'company' becomes 'co' (abbreviation).
'hurts' becomes 'aches' ('ache' can be a synonym of 'hurt').
'co'+'aches'='COACHES'
(Other definitions for coaches that I've seen before include "cabins at the back" , "Trainers for athletes or transport vehicles" , "People carriers and trainers" , "Buses, carriages" , "Trains" .)