Crossword Genius

Prophet who reformed some dipsomaniacs (4)

Ross

I believe the answer is:

amos

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

'prophet' is the definition.
(biblical prophet)

'reformed some dipsomaniacs' is the wordplay.
I cannot quite see how this works, but
'some' could be 'a' and 'a' is found within the answer.
The remaining letters 'mos' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'who' is the link.

Can you help me to learn more?

(Other definitions for amos that I've seen before include "Old Testament prophet" , "Prophet in the Bible" , "man" , "Hebrew prophet" , "American wild dog" .)

I've seen this clue in the Evening Standard.
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