Crossword Genius

Mark beginning to feel warmer? (5)

Ross

I believe the answer is:

scarf

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

'warmer?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for scarf that I've seen before include "Item of neckwear" , "Warming garment" , "Something worn around the head or neck and shoulders" , "Garment worn round head, neck, or shoulders" , "Item worn on head or shoulders" .)

I've seen this clue in The Sun.
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