Exam giver (6)
I believe the answer is:
tester
'exam giver' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tester that I've seen before include "One who analyses a bed canopy" , "Kind of examiner or bed canopy" , "One who tries out - canopy" , "A canopy over a large bed, or an examiner" , "One trying out; canopy over bed" .)