A mate to make much of (4)

I believe the answer is:

chum

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

'a mate' is the definition.
(I've seen this before)

'make much of' is the wordplay.
'much' can be anagrammed to 'CHUM'.
But, I'm not clear how this is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for chum that I've seen before include "Close friend (colloq.)" , "Pal, mate" , "Salmon" , "Pal, buddy" , "Good friend" .)

I've seen this clue in the Evening Standard.

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