Crossword Genius

Leave behind with charge and heat (7)

Ross

I believe the answer is:

passion

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'heat' is the definition.
(synonyms)

'leave behind with charge' is the wordplay.
'leave behind' becomes 'pass' (pass is a kind of leave. I am not sure about the 'behind' bit.).
'with' means one lot of letters go next to another.
'charge' becomes 'ion' (an ion is a charged particle).
'pass'+'ion'='PASSION'

'and' is the link.

Can you help me to learn more?

(Other definitions for passion that I've seen before include "Strong emotion, anger or love" , "Strong feeling, or anger or desire possibly" , "thing one really cares about" , "Rage" , "Fervent love" .)

I've seen this clue in The Hindu.
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