Crossword Genius

Ring Gwyn? In terrible rage about functional structural cellular unit? (9)

Ross

I believe the answer is:

organelle

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'functional structural cellular unit?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'ring gwyn? in terrible rage' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'gwyn?' becomes 'Nell' (Nell Gwyn, mistress of Charles II).
'in' is an insertion indicator.
'terrible' indicates an anagram.
'rage' is an anagram of 'rgae'.
'nell' going into 'rgae' is 'rganelle'.
'o'+'rganelle'='ORGANELLE'

'about' acts as a link.

Can you help me to learn more?

(Another definition for organelle that I've seen is " Specialised part of a cell".)

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