Very simply, the opposite of a surrender demand? (5,4)
I believe the answer is:
hands down
'very simply' is the definition.
'the opposite of a surrender demand?' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is found in the answer.
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for hands down that I've seen before include "without effort" , "without difficulty" , "extremely easily" , "with ease" , "Leaves - effortlessly" .)