Flier born to get out of line? (5)
I believe the answer is:
robin
'flier' is the definition.
(robin is a kind of birdanimal)
'born to get out of line?' is the wordplay.
'born' becomes 'b' (abbreviation next to the year of someone's birth).
'to get' means one lot of letters goes inside another.
'out of line?' becomes 'roin' (I can't justify this - if you can you should give a lot more credence to this answer).
'b' going within 'roin' is 'ROBIN'.
Can you help me to learn more?
(Other definitions for robin that I've seen before include "Bird - boy's name" , "Small brown and red bird" , "Bird; Batman's aide" , "Small songbird" , "Christmas songbird" .)