Guess capital of Somalia's very warm (4)
I believe the answer is:
shot
'guess' is the definition.
('shot' can be a synonym of 'guess')
'capital of somalia's very warm' is the wordplay.
'capital of' suggests taking the first letters.
'very warm' becomes 'hot' (I've seen this before).
The initial letter of 'somalia' is 's'.
's'+'hot'='SHOT'
(Other definitions for shot that I've seen before include "Fired - attempt" , "completely gone" , "Injection" , "Crack" , "[FILM]" .)