Cry of pain confined to empty carriage (8)
I believe the answer is:
barouche
'carriage' is the definition.
(barouche is a kind of carriage)
'cry of pain confined to empty' is the wordplay.
'cry of pain' becomes 'ouch' (I've seen this before).
'confined to' means one lot of letters goes inside another.
'empty' becomes 'bare' ('bare' can be similar in meaning to 'empty').
'ouch' going within 'bare' is 'BAROUCHE'.
(Other definitions for barouche that I've seen before include "Horse-drawn carriage - Cuba hero (anag)" , "Four-wheeled carriage" , "Victorian carriage" .)