Crossword Genius

Group gives actors energy (5)

Ross

I believe the answer is:

caste

'group' is the definition.
(an ethnic or social group)

'actors energy' is the wordplay.
'actors' becomes 'cast' (group of actors).
'energy' becomes 'e' (physics symbol as in E=mc2).
'cast'+'e'='CASTE'

'gives' acts as a link.

(Other definitions for caste that I've seen before include "Hindu social rank" , "Level in society" , "Brahmans for instance" , "Social order" , "Hereditary Hindu social division" .)

I've seen this clue in The Mirror.
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