Be liable for where dog’s dinner might end up? (5)
I believe the answer is:
incur
'be liable for' is the definition.
(eg to incur a fine is to be liable for it)
'dog's dinner might end up?' is the wordplay.
I cannot really see how this works, but
'dog' could be 'cur' (both can mean a despicable person) and 'cur' is found within the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'where' acts as a link.
(Other definitions for incur that I've seen before include "Become liable to (something) through one's actions" , "Become subject to (something unpleasant)" , "Lay oneself open to" , "Sustain" , "Become responsible for" .)