Crossword Genius

Wrap in cotton wool against the cold (3)

Ross

I believe the answer is:

lag

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

'cold' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'wrap in cotton wool against' is the wordplay.
'wrap in' says the answer is hidden in the clue (I've seen 'wrapped in' mean this).
'LAG' can be found hidden inside 'cotton wool against'.

'the' is the link.

Can you help me to learn more?

(Other definitions for lag that I've seen before include "Drop behind" , "Fall behind; insulate" , "Get behind; convict" , "An old one is a convict" , "Insulate (pipes)" .)

I've seen this clue in the Evening Standard.
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