Crossword Genius

'Pudding!' announced by footballer in glad rags (6,4)

Ross

I believe the answer is:

sunday best

I'm a little stuck... Click here to teach me more about this clue!

'glad rags' is the definition.

'pudding announced by footballer' is the wordplay.
I cannot quite see how this works, but
'footballer' could be 'best' (George Best) and 'best' is present in the answer.
The remaining letters 'sunday' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Other definitions for sunday best that I've seen before include "smartest suit, say" , "One's finest outfit" , "clothes for the day after" , "Clothes kept for special occasions" , "Smartest clothes" .)

I've seen this clue in The Everyman puzzle in The Observer.
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