Put off job, one involving little power (8)
I believe the answer is:
postpone
'put off' is the definition.
('postpone' can be a synonym of 'put off')
'job one involving little power' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'involving' means one lot of letters goes inside another.
'little' says to take the initial letters.
The first letter of 'power' is 'p'.
'post'+'one'='postone'
'postone' going around 'p' is 'POSTPONE'.
(Other definitions for postpone that I've seen before include "'Hold over, defer (8)'" , "Put off till later" , "Put off, defer" , "Put off till another time" , "pigeon-hole" .)