Son caught farm animal on your bike! (5)
I believe the answer is:
scram
'on your bike' is the definition.
(interjections with similar meaning)
'son caught farm animal' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'caught' becomes 'c' (cricket abbreviation).
'farm animal' becomes 'ram' (male sheep).
's'+'c'+'ram'='SCRAM'
(Other definitions for scram that I've seen before include "Hop it!" , "Beat it, get lost, go away" , "Vamoose" , "on your bike!" , "Make oneself scarce" .)