It recoils before young dog, upset (3,2)
I believe the answer is:
tip up
'upset' is the definition.
(upset can mean to tip over)
'it recoils before young dog' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'young' could be 'pup' (pup is a kind of young) and 'pup' is located in the answer.
A single letter 'i' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tip up that I've seen before include "overturn" , "More left on plate" .)