Bird will be mating - Apr. roughly (9)
I believe the answer is:
ptarmigan
'bird' is the definition.
(ptarmigan is a kind of bird)
'will be mating apr roughly' is the wordplay.
'will' says to put letters next to each other (I've seen this in other clues).
'roughly' is an anagram indicator.
'mating'+'apr' is 'matingapr'.
'matingapr' anagrammed gives 'PTARMIGAN'.
(Other definitions for ptarmigan that I've seen before include "Game bird living the high life" , "turns white in winter" , "Grouse-like bird" , "Game bird, white in winter" , "Bird of the grouse family" .)