Look, going round the bend, for dressing (5)
I believe the answer is:
gauze
'dressing' is the definition.
(I have seen 'Medical dressing ' mean 'gauze' so perhaps 'dressing' could also mean 'gauze')
'look going round the bend' is the wordplay.
'look' becomes 'gaze' (gaze is a kind of look**).
'going round' is an insertion indicator.
'the bend' becomes 'u' (a U-bend is a kind of bend - pipe under sink).
'gaze' enclosing 'u' is 'GAUZE'.
'for' acts as a link.
(Other definitions for gauze that I've seen before include "Thin transparent material" , "Openwork fabric - fine mesh" , "Medical cloth" , "Thin bleached cotton cloth used for dressings etc" , "Medicinal cloth" .)