Passage to a water-girt land? (5)
I believe the answer is:
aisle
'passage' is the definition.
(aisle can mean a path or passageway)
'a water-girt land?' is the wordplay.
'water-girt land?' becomes 'isle' (I've seen this in another clue).
'a'+'isle'='AISLE'
'to' acts as a link.
(Other definitions for aisle that I've seen before include "Supermarket feature" , "way to the altar?" , "Passageway in church as for bride" , "Supermarket passageway" , "Corridor" .)