He pretends their copy is spoiled (9)
I believe the answer is:
hypocrite
'he pretends' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'their copy is spoiled' is the wordplay.
'is spoiled' is an anagram indicator.
'their'+'copy'='theircopy'
'theircopy' with letters rearranged gives 'HYPOCRITE'.
Can you help me to learn more?
(Other definitions for hypocrite that I've seen before include "Dissembler" , "For example, Tartuffe" , "fraud" , "One who does not practise what they preach" , "Insincere person affecting virtue" .)