US Senate a second away, possibly, from revolt (8)
I believe the answer is:
nauseate
'revolt' is the definition.
(nauseating is a kind of revolting)
'us senate a second away possibly' is the wordplay.
'us' becomes 'usa' ('USA' can be a synonym of 'us').
'a second' becomes 's' (common abbreviation).
'away' indicates named letters should be taken away.
'possibly' is an anagram indicator.
'usa'+'senate'='usasenate'
'usasenate' with 's' removed is 'uasenate'.
'uasenate' anagrammed gives 'NAUSEATE'.
'from' acts as a link.
(Other definitions for nauseate that I've seen before include "Sicken" , "Make to feel sick, revolt" , "Make (someone) sick" , "Make to feel imminent sickness, turn stomach" , "Eaten in USA - would make you feel sick" .)