Decorator's suffering -- short term (7)
I believe the answer is:
painter
'decorator's' is the definition.
(I've seen this before)
'suffering short term' is the wordplay.
'suffering' becomes 'pain' (I've seen this before).
'short' means to remove the last letter.
'term' with its last letter removed is 'ter'.
'pain'+'ter'='PAINTER'
(Other definitions for painter that I've seen before include "One who has a brush" , "Eg, Constable" , "someone like Monet" , "One of two Johns" , "keeps a boat by the bank" .)