A cold one must be aroused to do this (8)

I believe the answer is:

canoodle

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'aroused to do this' is the definition.
The definition suggests a singular noun but the answer is not.

'a cold one must' is the wordplay.
'a cold one' anagrams to 'CANOODLE'.
Though, I'm unsure how this is indicated.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for canoodle that I've seen before include "Kiss and cuddle (informal)" , "Fondle" , "neck" , "Behave amorously" , "Smooch" .)

I've seen this clue in The Independent.

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