A Greek cup put on plant (10)

I believe the answer is:

acotyledon

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'plant' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'a greek cup put on' is the wordplay.
'greek cup' becomes 'cotyle' (I've seen this before).
'put on' becomes 'don' (as in donning or putting on an item of clothing).
'a'+'cotyle'+'don'='ACOTYLEDON'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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