Sentence: 'Enjoy being realistic (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'
'being' is the link.
(Other definitions for lifelike that I've seen before include "Could be mistaken for the real thing, like figure in wax museum" , "Resembling a real person or thing" , "Exactly like real person or thing" , "Realistic" , "True-to-life" .)