Crossword Genius

Artificial ice plant (8)

Ross

I believe the answer is:

shamrock

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This might be a double definition.

'artificial ice' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'plant' is the second definition.
(shamrock is a kind of plant)

Can you help me to learn more?

(Other definitions for shamrock that I've seen before include "Sign of first part of 10 [IRISH [SEA]]" , "Symbol of Ireland" , "symbolic of Ireland" , "Clover-like plant" , "Mash cork into the emblem" .)

I've seen this clue in the Evening Standard.
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