A seed we cooked, though it may not be edible (7)
I believe the answer is:
seaweed
'it may not be edible' is the definition.
The definition suggests a singular noun which matches the answer.
'a seed we cooked' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'a'+'seed'+'we'='aseedwe'
'aseedwe' anagrammed gives 'SEAWEED'.
'though' is the link.
Can you help me to learn more?
(Other definitions for seaweed that I've seen before include "Marine growth" , "Plant such as kelp" , "what's been washed up" , "Laver perhaps" , "Wrack" .)