Summoning upset fellow Conservative out of action (9)
I believe the answer is:
evocation
'summoning' is the definition.
(I know that summoning can be written as evocation)
'upset fellow conservative out of action' is the wordplay.
'upset' says the letters should be written in reverse.
'fellow' becomes 'cove' (British slang term).
'conservative' becomes 'C' (UK political abbreviation).
'out of' suggests deleting specific letters.
'cove' reversed gives 'evoc'.
'action' with 'c' taken out is 'ation'.
'evoc'+'ation'='EVOCATION'
(Other definitions for evocation that I've seen before include "A calling forth" , "A spell" .)