Pre-recorded John Kelly? (6)
I believe the answer is:
canned
'pre-recorded' is the definition.
(as in canned laughter)
'john kelly?' is the wordplay.
'john' becomes 'can' (both can informally mean toilet).
'kelly?' becomes 'ned' (outlaw Ned Kelly).
'can'+'ned'='CANNED'
(Other definitions for canned that I've seen before include "A lot of beer is" , "drunk" , "Pickled" , "(Food) from tin; (programme) pre-recorded" , "preserved in containers" .)