Crossword Genius

Half-rum could become unhealthy (7)

Ross

I believe the answer is:

harmful

'unhealthy' is the definition.
(thesaurus)

'half-rum could become' is the wordplay.
'could become' indicates anagramming the letters.
'half'+'rum'='halfrum'
'halfrum' is an anagram of 'HARMFUL'.

(Other definitions for harmful that I've seen before include "Half rum (anag.)" , "Injurious" , "Dangerous, damaging" , "Causing injury or damage, say poison or malice" , "Noxious" .)

I've seen this clue in the Sydney Morning Herald.
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