Initial boost galvanized reformer (12)

I believe the answer is:

abolitionist

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

'reformer' is the definition.
(abolitionist is a kind of reformer)

'initial boost galvanized' is the wordplay.
'initial boost' can be anagrammed to 'ABOLITIONIST'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for abolitionist that I've seen before include "Anti-slavery campaigner" , "Reformer (eg Wilberforce)" , "One favouring end of capital punishment" , "One against, eg, slavery" .)

I've seen this clue in The Guardian.

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