Not a well-cooked portion of savoury (7)
I believe the answer is:
rarebit
'savoury' is the definition.
(I know that rarebit is a type of savoury)
'not a well-cooked portion' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'portion' could be 're' (re is a kind of portion) and 're' is present in the answer.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for rarebit that I've seen before include "Simple dish" , "cheesy meal" , "Cheese/toast savoury" , "Arbiter (anag) -- snack" , "See 8 Across" .)