Headwear I hear you left with the Company in a seaport and resort in S.W. Mexico (8)

'w mexico' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'headwear i hear you left with the company in a seaport and resort in s' is the wordplay.
I cannot quite see how this works, but
'headwear' could be 'cap' (cap is a type of hat) and 'cap' is found in the answer.
'i' could be 'a' and 'a' is present in the answer.
'you' could be 'u' (commonly used in online communication) and 'u' is found in the answer.
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
'company' could be 'co' (abbreviation) and 'co' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?