Doubtful, hesitant (6)
I believe the answer is:
unsure
This clue is a double definition.
'doubtful' is the first definition.
(similar in meaning)
'hesitant' is the second definition.
(I've seen this in another clue)
(Other definitions for unsure that I've seen before include "Not certain, doubtful" , "Not certain, undecided" , "Hesitant" , "Not certain, somewhat confused" , "Not certain or decided" .)