A girl with energy restricts divinities (7)

I believe the answer is:

deities

'divinities' is the definition.
(I know this)

'a girl with energy restricts' is the wordplay.
'a girl' becomes 'Di'.
'with' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mci).
'restricts' becomes 'ties' (tying is a kind of restricting).
'di' enclosing 'e' is 'dei'.
'dei'+'ties'='DEITIES'

(Another definition for deities that I've seen is " Gods and goddesses".)

I've seen this clue in the Sydney Morning Herald.

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