Victoria’s finally amused about being taken for granted (7)
I believe the answer is:
assumed
'being taken for granted' is the definition.
(synonyms)
'victoria's finally amused about' is the wordplay.
'finally' suggests the final letters.
'about' is an anagram indicator.
The last letter of 'victorias' is 's'.
's'+'amused'='samused'
'samused' with letters rearranged gives 'ASSUMED'.
(Other definitions for assumed that I've seen before include "Fancied" , "Took (control)" , "False" , "Accepted as true without actual proof" , "Took (responsibility)" .)