Someone 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!

'someone' is the definition.
(I know that chum is a type of sibling)

'make much of?' is the wordplay.
'much' anagrams to 'CHUM'.
However, I am unsure how the anagram is indicated.

'to' is the link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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