Candidate in vote against source of coal energy (7)

I believe the answer is:

nominee

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'candidate in vote' is the definition.
'nominee' can be an answer for 'candidate' (synonyms). I am not certain of the 'in vote' bit.

'against source of coal energy' is the wordplay.
'against' becomes 'no'.
'source of coal' becomes 'mine' (I've seen this in another clue).
'energy' becomes 'e' (physics symbol as in E=mc2).
'no'+'mine'+'e'='NOMINEE'

Can you help me to learn more?

(Other definitions for nominee that I've seen before include "Aspirant" , "He's put forward" , "Chosen person" , "Person standing for office" , "One suggested (for post)" .)

I've seen this clue in The Telegraph.

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