Crossword Genius

Ex-star perhaps seen in crowd scenes (6)

Ross

I believe the answer is:

extras

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'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" .)

I've seen this clue in The Globe and Mail.
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