On the inside my sheepskin boot feels hot and sticky (5)

I believe the answer is:

muggy

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'sticky' is the definition.
(I know that sticky can be written as muggy)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for muggy that I've seen before include "close" , "Oppressively humid" , "Warm and wet" , "Warm and humid" , "Unpleasantly humid" .)

I've seen this clue in The Irish Times.

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