Flier makes a revolutionary jump (8)
I believe the answer is:
redstart
'flier' is the definition.
(redstart is a kind of birdanimal)
'a revolutionary jump' is the wordplay.
'a revolutionary' becomes 'red' (red can informally mean a communist).
'jump' becomes 'start' (as in starting or jumping in fear).
'red'+'start'='REDSTART'
'makes' acts as a link.
(Other definitions for redstart that I've seen before include "Half of 1D [GAME OR BIRD]" , "bird from Europe" , "Songbird" , "Bird of the thrush family" , "One sings" .)