Central idea from Keith Emerson (5)

I believe the answer is:

theme

'central idea' is the definition.

'from keith emerson' is the wordplay.
'from' says the answer is hidden in the clue.
'THEME' is hidden within 'keith emerson'.

(Other definitions for theme that I've seen before include "argument" , "Subject matter, motif" , "Main idea or topic" , "sort of tune" , "thing under discussion" .)

I've seen this clue in The Sun.

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