That flier from Milwaukee (3)
I believe the answer is:
auk
'that flier' is the definition.
(auk is a kind of birdanimal)
'from milwaukee' is the wordplay.
'from' indicates the answer is hidden within the clue.
'AUK' can be found hidden inside 'milwaukee'.
(Other definitions for auk that I've seen before include "Stocky diving bird" , "Black/white northern diver" , "Great ---, extinct seabird" , "Black-and-white diving bird of northern seas" , "Short-winged seabird" .)