Crossword Genius

Comparatively cool creeper? (8)

Ross

I believe the answer is:

cucumber

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

This could be a double definition.

'comparatively cool' is the first definition.
I know that 'cool' relates to this answer. I also know that both the answer and definition are singular nouns

'creeper?' is the second definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for cucumber that I've seen before include "Proverbially cool salad ingredient" , "Three dn item" , "Ecu crumb (anag.)" , "Green salad fruit" , "Proverbially cool salad plant" .)

I've seen this clue in The Irish Independent.
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