Leading performer's trendy spacecraft (8)
I believe the answer is:
starship
'spacecraft' is the definition.
(I know that starship is a type of spacecraft)
'leading performer's trendy' is the wordplay.
'leading performer's' becomes 'star's'.
'trendy' becomes 'hip' (I've seen this before).
'stars'+'hip'='STARSHIP'
(Other definitions for starship that I've seen before include "TV's USS Enterprise, for instance" , "Enterprise on show" , "Captain James T. Kirk's command" , "Space traveller" , "Eg, the USS Enterprise" .)