Don't cook enough pig's back for outsider (8)
I believe the answer is:
underdog
'outsider' is the definition.
(I've seen this before)
'don't cook enough pig's back' is the wordplay.
I cannot quite see how this works, but
'cook' could be 'do' (do can mean to cook) and 'do' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for underdog that I've seen before include "Such is unlikely to succeed" , "Canine expected to lose?" , "One at a disadvantage" , "Likely loser" , "Less fancied competitor" .)