Some in crew translated play? That's not realistic (8)
I believe the answer is:
abstract
'not realistic' is the definition.
(as in abstract art)
'some in crew translated play?' is the wordplay.
'some in crew' becomes 'abs' (AB can mean able seaman, a member of a crew).
'translated' becomes 'tr' (abbreviation used when referencing books).
'play?' becomes 'act' (playing is a kind of acting).
'abs'+'tr'+'act'='ABSTRACT'
'that's' is the link.
(Other definitions for abstract that I've seen before include "concept" , "Art form; remove" , "a work of modern art" , "Nick" , "Remove; theoretical" .)