Coated area of meat packaging isn't wide (9)

'coated area' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'meat packaging isn't wide' is the wordplay.
I cannot quite understand how this works, but
'isn't' could be 'aint' (non-standard version of 'isn't') and 'aint' is present in the answer.
'wide' could be 'w' (abbreviation e.g. in cricket) and 'w' is found within the answer.
'meat' could be 'pork' (pork is a kind of meat) and 'pork' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'of' is the link.

Can you help me to learn more?