Realistic sentence - enjoy! (8)
I believe the answer is:
lifelike
'realistic' is the definition.
(similar in meaning)
'sentence enjoy' is the wordplay.
'sentence' becomes 'life' (life sentence in prison).
'enjoy' becomes 'like' (like can mean to appreciate or enjoy something).
'life'+'like'='LIFELIKE'
(Other definitions for lifelike that I've seen before include "Exactly like real person or thing" , "Realistic" , "Could be mistaken for the real thing, like figure in wax museum" , "True-to-life" , "Resembling a real person or thing" .)