Unapologetically overlooked raised threads on fabric surface (3)

I believe the answer is:

nap

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

'fabric surface' is the definition.
(I've seen this in another clue)

'unapologetically overlooked raised threads' is the wordplay.
'NAP' is hidden within the letters.
But, I am unsure how this is indicated.

'on' is the link.

Can you help me to learn more?

(Other definitions for nap that I've seen before include "A brief sleep, forty winks" , "A brief snooze" , "Sleep lightly" , "Snatch forty winks" , "A fuzzy surface texture" .)

I've seen this clue in The Irish Times.

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