Mid-May election? Opposition leader finds god (6)
I believe the answer is:
apollo
'god' is the definition.
(Apollo is a Greek god)
'mid-may election? opposition leader' is the wordplay.
'mid' means to look at the middle letters.
'election?' becomes 'poll' (I've seen this before).
'leader' says to take the initial letters.
The middle letter of 'may' is 'a'.
The first letter of 'opposition' is 'o'.
'a'+'poll'+'o'='APOLLO'
'finds' acts as a link.
(Other definitions for apollo that I've seen before include "Greek sun god and leader of the Muses" , "US moon landing programme" , "Greek god of the sun (6)" , "London theatre" , "Deity" .)