Cryptic crossword clue
String of islands having a charge for crossing? 5

The most common and most likely answer to this crossword clue is the 5 letter word ATOLL

A
T
O
L
L


Buddy explains!

The straight part
We know that "String of islands" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case string of islands = atoll.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ATOLL mean?

ATOLL noun
  1. A type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform. Atolls have a unique geology, so not all islands with a reef and a lagoon are atolls

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