Who let farmers supply weapons? (13)

I believe the answer is:

flamethrowers

'weapons?' is the definition.
(flamethrower is a kind of weapon)

'who let farmers supply' is the wordplay.
'supply' is an anagram indicator (in a supple way).
'who'+'let'+'farmers'='wholetfarmers'
'wholetfarmers' is an anagram of 'FLAMETHROWERS'.

I've seen this clue in The Daily Mail.

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