Where there’s a charge to go round the lagoon? (5)
I believe the answer is:
atoll
'where there's a charge to go round the lagoon?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'where there's a charge' is the wordplay.
'where' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'there's a charge' becomes 'toll' (toll is a kind of charge).
'a'+'toll'='ATOLL'
Can you help me to learn more?
(Other definitions for atoll that I've seen before include "Ring of coral" , "land threatened by rising sea levels" , "Coral isle" , "Pacific coral island" , "Coral circle" .)