So, if he were given only half a chance... (5)
I believe the answer is:
hence
'so' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hence that I've seen before include "In the future; begone!" , "Therefore, consequently" , "It follows from that fact" , "For this reason; in the future" , "As a consequence" .)