Put off upright individual holding power (8)
I believe the answer is:
postpone
'put off' is the definition.
('postpone' can be a synonym of 'put off')
'upright individual holding power' is the wordplay.
'upright' becomes 'post' (post is a kind of upright**).
'individual' becomes 'one'.
'holding' is an insertion indicator.
'power' becomes '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 until future date" , "Put off, defer" , "Put off till another time" .)