Crossword Genius

Plant edited Montgomery's part . . . art to disappear (10)

Ross

I believe the answer is:

gymnosperm

I'm a little stuck... Click here to teach me more about this clue!

'plant' is the definition.
(gymnosperm is a kind of plant)

'edited montgomery's part art to disappear' is the wordplay.
I cannot really understand how this works, but
'part' could be 'os' (os is a kind of part) and 'os' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for gymnosperm that I've seen is " Pine, maybe".)

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