What could be overt target of electioneering (8,5)
I believe the answer is:
floating voter
'target of electioneering' is the definition.
I know nothing about this answer so I can't judge whether this works.
'what could be overt' is the wordplay.
'what' becomes 'floating' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'could be' indicates an anagram.
'overt' anagrammed gives 'voter'.
'floating'+'voter'='FLOATING VOTER'
Can you help me to learn more?
(Other definitions for floating voter that I've seen before include "One whose political allegiance might easily change" , "one by no means partisan - with 24d" , "One who may be swayed either way at election time" , "One without political affiliation" , "Undecided elector" .)