Ornamentation found in wide corridor (5)
I believe the answer is:
decor
'ornamentation' is the definition.
(I know that decor is a type of ornamentation)
'in wide corridor' is the wordplay.
'in' says the answer is hidden in the clue.
'DECOR' is hidden in the letters of 'wide corridor'.
'found' acts as a link.
(Other definitions for decor that I've seen before include "Choice of colour" , "Room colour scheme, furnishings, etc" , "Interior design; stage scenery" , "Interior colour scheme and furnishing" , "stage background" .)