Crossword Genius

Central idea Iolanthe means to convey (5)

Ross

I believe the answer is:

theme

I'm a little stuck... Click here to teach me more about this clue!

'central idea' is the definition.
(I've seen this in another clue)

'iolanthe means to convey' is the wordplay.
'THEME' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for theme that I've seen before include "tune used in Enigma Variations?" , "He met (anag) - subject" , "sort of tune" , "subject,motif" , "Subject set for discussion" .)

I've seen this clue in The Sun.
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