See eel fighting with chub -- it could be Danish (4,6)
I believe the answer is:
blue cheese
'it could be danish' is the definition.
'see eel fighting with chub' is the wordplay.
'fighting with' indicates an anagram (I've seen this in other clues).
'see'+'eel'='seeeel'
'seeeel' with its letters mixed up with 'chub' gives 'BLUE CHEESE'.
(Other definitions for blue cheese that I've seen before include "Dairy product" , "Stilton or Roquefort, for example" , "Danish for example" , "Stilton, for instance" , "Stilton, perhaps" .)