Crossword Genius

Concerning ex-Liberal (8)

Ross

I believe the answer is:

reformer

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'liberal' is the definition.
(thesaurus)

'concerning ex' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'ex' becomes 'former' (I can't explain this - if you can you should give a lot more credence to this answer).
're'+'former'='REFORMER'

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(Other definitions for reformer that I've seen before include "eg Luther" , "Person who advocates change" , "One making improving changes" , "One dealing with abuses" , "One changing for the better" .)

I've seen this clue in The Sun.
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