Opposed state surveillance on vacation (6)
I believe the answer is:
averse
'opposed' is the definition.
(synonyms)
'state surveillance on vacation' is the wordplay.
'state' becomes 'aver' (both can mean to declare).
'on vacation' means to remove the middle letters (after the inside letters have vacated the word).
'surveillance' with its centre taken out is 'se'.
'aver'+'se'='AVERSE'
(Other definitions for averse that I've seen before include "Disinclined, maybe to hard work" , "Having a strong dislike" , "Indisposed" , "Disinclined or reluctant" , "Ill-disposed to (a poem?)" .)