Was aware of what wasn't woven (4)

I believe the answer is:

felt

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

'was aware of' is the definition.
(feel can mean to be aware of)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for felt that I've seen before include "Fabric - perceived by touch" , "Material - perceived by touch" , "Touched the matted fabric" , "Cloth; touched" , "Was affected by" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app