Give up in Split during inevitable outbreak of revolution (9)
I believe the answer is:
surrender
'give up' is the definition.
('surrender' can be a synonym of 'give up')
'split during inevitable outbreak of revolution' is the wordplay.
'split' becomes 'rend' (I've seen this before**).
'during' indicates putting letters inside.
'inevitable' becomes 'sure' ('sure' can be similar in meaning to 'inevitable').
'outbreak of' indicates taking the first letters.
The initial letter of 'revolution' is 'r'.
'rend' put into 'sure' is 'surrende'.
'surrende'+'r'='SURRENDER'
'in' is the link.
(Other definitions for surrender that I've seen before include "Cede" , "Submit (to an opponent)" , "Wave the white flag" , "Capitulate, relinquish" , "Yield - release" .)