Supporting group's about to get better (6)

I believe the answer is:

reform

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'better' is the definition.
(reforming is a kind of bettering)

'supporting group's about to' is the wordplay.
'supporting group' becomes 'rem' (I can't explain this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'to' becomes 'for'.
'rem' enclosing 'for' is 'REFORM'.

'get' is the link.

Can you help me to learn more?

(Other definitions for reform that I've seen before include "Change one's ways (for the better?)" , "Abandon evil practices" , "Go straight" , "Removal of abuses" , "Show improvement" .)

I've seen this clue in The Independent.

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