Fire up revolutionary meeting, including sandwiches (6)
I believe the answer is:
ignite
'fire up' is the definition.
(I know that fire up can be written as ignite)
'revolutionary meeting including sandwiches' is the wordplay.
'revolutionary' says the letters should be written backwards.
'sandwiches' indicates a hidden word (the solution is sandwiched in by the clue).
'etingi' can be found hidden inside 'meeting including'.
'etingi' back-to-front is 'IGNITE'.
(Other definitions for ignite that I've seen before include "Burn" , "Touch off; inflame" , "Cause to start burning" , "Detonate" , "Cause to catch fire" .)