Maybe seaweeds' improbable general age (5,5)
I believe the answer is:
green algae
'maybe seaweeds'' is the definition.
(some seaweeds are green algae)
'improbable general age' is the wordplay.
'improbable' indicates anagramming the letters (an improbable spelling).
'general'+'age'='generalage'
'generalage' anagrammed gives 'GREEN ALGAE'.
I've seen this clue in The Guardian.
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