Blinks, surprised about a medium woollen cloth (8)
I believe the answer is:
lambskin
'woollen cloth' is the definition.
(I've seen this before)
'blinks surprised about a medium' is the wordplay.
'surprised' indicates anagramming the letters.
'about' is an insertion indicator.
'medium' becomes 'm' (as in UK clothing sizes).
'blinks' is an anagram of 'lbskin'.
'a'+'m'='am'
'lbskin' placed around 'am' is 'LAMBSKIN'.
(Other definitions for lambskin that I've seen before include "Woollen cloth" , "Young sheep's pelt" .)