Contend the noise is made by a bird (7)
I believe the answer is:
Here is my best explanation:
'bird' is the definition.
(sparrow is a kind of bird)
'contend the noise' is the wordplay.
'contend' becomes 'spar' (sparring is a kind of contending).
'the noise' becomes 'row'.
'is made by a' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
(Other definitions for sparrow that I've seen before include "Singing bird", "Finch-like bird", "House bird", "Common town bird", "a British resident", "Small songbird", "Small brownish bird", "Cockney bird", "Passerine bird" and "Pirate".)