Ex-star perhaps seen in crowd scenes (6)
I believe the answer is:
extras
'in crowd scenes' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'ex-star perhaps' is the wordplay.
'perhaps' indicates an anagram.
'star' anagrammed gives 'tras'.
'ex'+'tras'='EXTRAS'
'seen' acts as a link.
Can you help me to learn more?
(Other definitions for extras that I've seen before include "Ancillaries" , "walk-on parts" , "Bit actors in film" , "Additional items surplus to requirements, spares" , "Spear carriers" .)