It could be Penn and Teller 's cut short? (4)
I believe the answer is:
sean
'it could be penn and teller' is the definition.
The definition suggests a singular noun which matches the answer.
''s cut short?' is the wordplay.
'cut short?' becomes 'ean' (I am not sure about this - if you are sure you should believe this answer much more).
's'+'ean'='SEAN'
Can you help me to learn more?
(Other definitions for sean that I've seen before include "guy at Number 10 [IRISHMAN]" , "Irish form of John" , "Penn, Bean or O'Casey" , "- - Connery (007)" .)