Pitch made by one favouring war? (4)
I believe the answer is:
hawk
This clue is a double definition.
'pitch' is the first definition.
(synonyms)
'one favouring war?' is the second definition.
(someone promoting military interventions)
'made by' acts as a link.
(Other definitions for hawk that I've seen before include "Flog" , "27 [SPIT]" , "someone for fighting" , "Falcon" , "Bird - warmonger" .)