Maggot first in beef to turn (3)

I believe the answer is:

bot

'maggot' is the definition.
(bot is a type of maggot)

'first in beef to turn' is the wordplay.
'first in beef' becomes 'b' (1st letter of 'beef').
'turn' is a reversal indicator.
'to' reversed gives 'ot'.
'b'+'ot'='BOT'

(Another definition for bot that I've seen is " machine".)

I've seen this clue in The Guardian.

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