Aquatic feature of Fiji retreats - a litre X? (6)
I believe the answer is:
lagoon
'aquatic feature' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'fiji retreats a litre x?' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'litre' could be 'l' (abbreviation) and 'l' is present in the answer.
The remaining letters 'goon' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for lagoon that I've seen before include "Coastal lake" , "Water protected by a coral reef" , "Body of salt water cut off from the sea" , "Atoll lake" , "Calm water behind reef" .)