See pottery modified to a set form (10)
I believe the answer is:
stereotype
'a set form' is the definition.
(I've seen this before)
'see pottery modified' is the wordplay.
'modified' is an anagram indicator.
'see'+'pottery'='seepottery'
'seepottery' anagrammed gives 'STEREOTYPE'.
'to' is the link.
(Other definitions for stereotype that I've seen before include "Conventional image" , "Fixed conventionalised image" , "received idea?" , "Image to which people are expected to conform" , "Typecast" .)