Somewhat pretentious political organisation losing leader (4)
I believe the answer is:
arty
'somewhat pretentious' is the definition.
'arty' can be an answer for 'pretentious' (similar in meaning). I'm unsure of the 'somewhat' bit.
'political organisation losing leader' is the wordplay.
'political organisation' becomes 'party' (I've seen this before).
'losing leader' means to remove the first letter.
'party' with its first letter taken off is 'ARTY'.
Can you help me to learn more?
(Other definitions for arty that I've seen before include "aesthetic pretensions" , "Having creative skills" , "Affectedly cultured" , "Interested in painting, music, literature, etc" , "Trendily into painting" .)