He wants money from Southend United! (3)

I believe the answer is:

dun

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'he wants money' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'from southend united' is the wordplay.
'from' indicates a hidden word.
'DUN' can be found hidden inside 'southend united'.

Can you help me to learn more?

(Other definitions for dun that I've seen before include "Dingy brown" , "... to demand payment" , "Dull greyish-brown colour" , "Pursue or badger for debt" , "Greyish brown colour" .)

I've seen this clue in the Evening Standard.

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