Like some speculation (4)
I believe the answer is:
idle
'like some speculation' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for idle that I've seen before include "Reluctant to work - Pythonesque Eric" , "Explosive stuff" , "Unoccupied or not in use" , "Eric, perhaps" , "not being engaged" .)