Bird in two arguments (7)

I believe the answer is:

sparrow

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'bird' is the definition.
(I know that sparrow is a bird)

'two arguments' is the wordplay.
'two arguments' can mean two substitutions for 'argument'.
'argument' becomes 'spar' (I can't explain this - if you can you should believe this answer much more).
'argument' becomes 'row' (to row is to argue).
'spar'+'row'='SPARROW'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for sparrow that I've seen before include "one on the wing" , "fowl, using outdated term" , "Common town bird" , "bird produced" , "a British resident" .)

I've seen this clue in The Sun.

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