In two different ways, fight bird (7)
I believe the answer is:
sparrow
'bird' is the definition.
(sparrow is a kind of bird)
'in two different ways fight' is the wordplay.
'in two different ways' becomes 'spar' (I can't justify this - if you can you should give a lot more credence to this answer).
'fight' becomes 'row' (I've seen this in another clue).
'spar'+'row'='SPARROW'
Can you help me to learn more?
(Other definitions for sparrow that I've seen before include "bird produced" , "A chirrupy city bird" , "Finch-like bird" , "Small brown bird" , "Who killed Cock Robin" .)