Green picked up correspondence — nothing to replace a study of the sea (10)
I believe the answer is:
oceanology
'study of the sea' is the definition.
(study of the ocean)
'green picked up correspondence nothing to replace a' is the wordplay.
I cannot quite see how this works, but
'nothing' could be 'no' (similar in meaning) and 'no' is found within the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
I've seen this clue in The Guardian.
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