Organ not pre-recorded? Right! (5)
I believe the answer is:
liver
'organ' is the definition.
(I know that liver is a type of internal organ)
'not pre-recorded? right' is the wordplay.
'not pre-recorded?' becomes 'live' (I've seen this in another clue).
'right' becomes 'r' (common abbreviation).
'live'+'r'='LIVER'
(Other definitions for liver that I've seen before include "Detoxifying organ" , "Bile-secreting organ" , "Organ; reddish-brown" , "Organ damaged by excess alcohol" , "Bodily organ" .)