American land found in sea passage (5)
I believe the answer is:
aisle
'sea passage' is the definition.
'aisle' can be an answer for 'passage' (aisle can mean a path or passageway). I am unsure of the 'sea' bit.
'american land' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'land' becomes 'isle' (isle is a kind of land).
'a'+'isle'='AISLE'
'found in' acts as a link.
Can you help me to learn more?
(Other definitions for aisle that I've seen before include "Way between seats" , "Extension of the nave in a church" , "Corridor" , "Passages between seating areas" , "Passage between seating areas" .)