Daughter, I guess, is changing masks (9)

I believe the answer is:

disguises

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'masks' is the definition.
The answer and definition can be both to do with perception as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?

'daughter i guess is changing' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'changing' is an anagram indicator.
'guess'+'is'='guessis'
'guessis' anagrammed gives 'sguises'.
'd'+'i'+'sguises'='DISGUISES'

Can you help me to learn more?

(Another definition for disguises that I've seen is " Camouflages, masks".)

I've seen this clue in The Telegraph.

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