A charge to see coral islands (5)
I believe the answer is:
atoll
'see coral islands' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'a charge' is the wordplay.
'charge' becomes 'toll' (toll is a kind of charge).
'a'+'toll'='ATOLL'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for atoll that I've seen before include "tropical island" , "Circular coral reef" , "Coral island with central lagoon" , "Bikini for one" , "Ring-shaped coral island" .)