Mark beginning to feel warmer? (5)
I believe the answer is:
scarf
'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" .)