An article in bed to help keep you warm (4)

I believe the answer is:

coat

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'help keep you warm' is the definition.
I can't tell whether this definition defines the answer.

'an article in bed' is the wordplay.
'an article' becomes 'a' (the indefinite article in English).
'in' indicates putting letters inside.
'bed' becomes 'cot' (cot is a kind of bed).
'a' inserted into 'cot' is 'COAT'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for coat that I've seen before include "Outer garment" , "Ulster, perhaps" , "Outer covering" , "blanket" , "Apply layer" .)

I've seen this clue in the Evening Standard.

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