Observer to give an opinion with some hesitation (6)
I believe the answer is:
viewer
'observer' is the definition.
(I know that viewer is a type of observer)
'an opinion with some hesitation' is the wordplay.
'an opinion' becomes 'view' ('view' can be a synonym of 'opinion').
'with' says to put letters next to each other.
'some hesitation' becomes 'er' (sound made while hesitating - um, er).
'view'+'er'='VIEWER'
'to give' acts as a link.
(Other definitions for viewer that I've seen before include "Spectator" , "One watching, eg, TV" , "Review for TV watcher" , "Observer" , "One who watches, say, TV" .)