Aromatic oil from metropolis endlessly attracting Reagan and Fitzgerald? (10)

I believe the answer is:

citronella

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'aromatic oil' is the definition.
The definition suggests a singular noun which matches the answer.

'metropolis endlessly attracting reagan and fitzgerald?' is the wordplay.
'metropolis endlessly' becomes 'cit' (I can't explain this - if you can you should believe this answer much more).
'attracting' is a charade indicator (letters next to each other).
'reagan' becomes 'ron' (I've seen this in another clue).
'and' says to put letters next to each other.
'fitzgerald?' becomes 'Ella' (musician Ella Fitzgerald).
'cit'+'ron'+'ella'='CITRONELLA'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for citronella that I've seen before include "Insect-repelling oil" , "South Asian grass" .)

I've seen this clue in The Times.

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