Food Molly Malone sells she will char? (9)
I believe the answer is:
shellfish
'food' is the definition.
(I know that shellfish is a type of seafood)
'she will char?' is the wordplay.
'will' becomes 'll' (contracted form, as in 'he'll' - 'he will').
'char?' becomes 'fish' (char is a kind of fish).
'she'+'ll'+'fish'='SHELLFISH'
'molly malone sells' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for shellfish that I've seen before include "Oysters, crabs, shrimps etc" , "paella ingredient" , "Crustaceans" , "Oysters, cockles, mussels etc" , "Category of seafood" .)