Everyman has pound, wanting a drink and a snack (5,5)
I believe the answer is:
melba toast
'a snack' is the definition.
'everyman has pound wanting a drink' is the wordplay.
I cannot really understand how this works, but
'everyman' could be 'me' (where the crossword setter is 'Everyman') and 'me' is present in the answer.
'pound' could be 'lb' (synonyms) and 'lb' is present in the answer.
'a' is within the answer.
'drink' could be 'toast' (toast is a kind of drink) and 'toast' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for melba toast that I've seen before include "crispy breakfast" , "food from the grill" , "Thin crisp food" .)