Forced to include remarkable square disguise (10)
I believe the answer is:
masquerade
'disguise' is the definition.
(I know that masquerade is a more specific form of the action disguise)
'forced to include remarkable square' is the wordplay.
'forced' becomes 'made' (both can mean coerced).
'to include' is an insertion indicator.
'remarkable' indicates an anagram.
'square' is an anagram of 'asquer'.
'made' enclosing 'asquer' is 'MASQUERADE'.
(Other definitions for masquerade that I've seen before include "Costume party" , "pose" , "Deception" , "Pretend to be someone one is not" , "Dress up" .)