Opinions formed with little or no information (7)
I believe the answer is:
guesses
'opinions formed with little or no information' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for guesses that I've seen before include "Opinions formed with little or no information" , "Conjectures, estimates" , "Hazards" , "Conjectures, reckons" , "Forms tentative opinion, thinks likely" .)