Allowed to remove large pants (5)
I believe the answer is:
awful
'pants' is the definition.
(I've seen this before)
'allowed to remove large' is the wordplay.
'allowed' becomes 'lawful' (I've seen this before).
'to remove' is a deletion indicator.
'large' becomes 'l'.
'lawful' with 'l' taken away is 'AWFUL'.
(Other definitions for awful that I've seen before include "pants" , "gruesome!" , "Not good at all" , "Really terrible, ghastly" , "Really terrible, deplorable" .)