Cord trousers good for pain (6)
I believe the answer is:
twinge
'pain' is the definition.
(I know that twinge is a type of pain)
'cord trousers good' is the wordplay.
'cord' becomes 'twine' (twine is a kind of cord).
'trousers' is an insertion indicator (to trouser can mean to steal or take).
'good' becomes 'g' (abbreviation).
'twine' placed around 'g' is 'TWINGE'.
'for' acts as a link.
(Other definitions for twinge that I've seen before include "Sharp pain (of conscience?)" , "A slight stab of pain" , "Small, sharp pain" , "Small pain eg from conscience" , "Pinch" .)