Lightly-cooked part missed in savoury dish (4)
I believe the answer is:
rare
'lightly-cooked' is the definition.
I can't tell whether this definition defines the answer.
'part missed in savoury dish' is the wordplay.
'part' becomes 'bit' (both mean a piece of something).
'missed in' is a deletion indicator.
'savoury dish' becomes 'rarebit' (I've seen this before).
'rarebit' with 'bit' taken out is 'RARE'.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Rear up to be uncommon" , "Very scarce like valuable antique" , "Very, very occasional" , "Not often seen - underdone" , "of low density" .)