Crossword Genius

Bait listener, raising master argument (7)

Ross

I believe the answer is:

lugworm

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'bait' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'listener raising master argument' is the wordplay.
'listener' becomes 'lug' (informal Scottish term for a person's ear).
'raising' says the letters should be written in reverse.
'master' becomes 'm'.
'argument' becomes 'row' (to row is to argue).
'm'+'row'='mrow'
'mrow' back-to-front is 'worm'.
'lug'+'worm'='LUGWORM'

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