Former star possibly playing very small parts (6)

I believe the answer is:

extras

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'playing very small parts' is the definition.
I can't tell whether this defines the answer.

'former star possibly' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'possibly' indicates anagramming the letters.
'star' is an anagram of 'tras'.
'ex'+'tras'='EXTRAS'

Can you help me to learn more?

(Other definitions for extras that I've seen before include "Bit players in film" , "Wides, no-balls, etc." , "Bit players, actors without dialogue" , "walk-on parts" , "Sundries" .)

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