Look around centre of Rouen for thin fabric (5)
I believe the answer is:
gauze
'thin fabric' is the definition.
(I've seen this before)
'look around centre of rouen' is the wordplay.
'look' becomes 'gaze' (gaze is a kind of look**).
'around' is an insertion indicator.
'centre of' means to look at the middle letters.
The centre of 'rouen' is 'u'.
'gaze' going around 'u' is 'GAUZE'.
'for' is the link.
(Other definitions for gauze that I've seen before include "Thin, transparent fabric" , "Medicinal cloth" , "Openwork fabric - fine mesh" , "Medical dressing" , "first-aid material" .)