That of a sleepy baby? (5)

I believe the answer is:

nappy

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'baby?' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nappy that I've seen before include "Baby garment" , "Diaper" , "Baby's garment" , "One pinned on baby" , "Baby wear" .)

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