Crossword Genius

Marguerita throttles one having row (6)

Ross

I believe the answer is:

arguer

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'row' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'marguerita throttles one having' is the wordplay.
'one having' indicates a hidden word.
'ARGUER' is hidden within 'marguerita throttles'.

Can you help me to learn more?

(Other definitions for arguer that I've seen before include "He reasons" , "One in dispute" , "One engages in debate" .)

I've seen this clue in The Sun.
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