Admit defeat and return (5)
I believe the answer is:
yield
I believe this clue is a double definition.
'admit defeat' is the first definition.
(I've seen this before)
'return' is the second definition.
(I know that return can be written as yield)
'and' acts as a link.
(Other definitions for yield that I've seen before include "Succumb" , "admit defeat" , "Stop defending" , "return on capital" , "Surrende, give in" .)