Nuns fought to hide faces - to not be desired (8)

I believe the answer is:

unsought

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

'nuns fought to hide faces' is the definition.
I can't tell whether this defines the answer.

'not be desired' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'be desired' becomes 'sought' (I've seen this in another clue).
'un'+'sought'='UNSOUGHT'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for unsought that I've seen before include "unlike Sir Percy Blakeney" , "not requested" , "Untried" , "Not looked for or desired" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.