Eccentric co-stars in part of Breakfast at Tiffany's (9)

I believe the answer is:

croissant

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'breakfast at tiffany's' is the definition.
I can't judge whether this defines the answer.

'eccentric co-stars in' is the wordplay.
'eccentric' indicates anagramming the letters.
'co'+'stars'+'in'='costarsin'
'costarsin' anagrammed gives 'CROISSANT'.

'part of' is the link.

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(Other definitions for croissant that I've seen before include "Continental breakfast crescent" , "A rich crescrent-shaped bread roll" , "Breakfast item" , "Breakfast pastry" , "food item" .)

I've seen this clue in The Times.

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