Flier spouse distributed in school (5,7)
I believe the answer is:
house sparrow
'flier' is the definition.
(house sparrow is a kind of birdanimal)
'spouse distributed in school' is the wordplay.
'distributed' indicates an anagram.
'in' means one lot of letters goes inside another.
'school' becomes 'harrow' (famous UK public school**).
'spouse' anagrammed gives 'ousesp'.
'ousesp' inserted into 'harrow' is 'HOUSE SPARROW'.
(Other definitions for house sparrow that I've seen before include "Winger" , "one chirpy?" , "Flier" .)