Oven gadget (5)
I believe the answer is:
timer
'oven gadget' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for timer that I've seen before include "Clock or watch" , "hourglass" , "one of 14 [CUCKOO CLOCKS]" , "Maybe watch" , "Pre-set switch" .)