Crossword Genius

Beware over aunt brewing purgative medicine (8)

Ross

I believe the answer is:

evacuant

'purgative medicine' is the definition.

'beware over aunt brewing' is the wordplay.
'beware' becomes 'cave' (old-fashioned term meaning 'look out').
'over' is a reversal indicator.
'brewing' is an anagram indicator.
'cave' written backwards gives 'evac'.
'aunt' with letters rearranged gives 'uant'.
'evac'+'uant'='EVACUANT'

I've seen this clue in The Times.
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