Crossword Genius

Clue deciphered about a central cluster of Egyptian trees (9)


I believe the answer is:


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'trees' is the definition.
(eucalyptus is a kind of tree)

'clue deciphered about a central cluster of egyptian' is the wordplay.
I cannot really understand how this works, but
'about' could be 'ca' (short for circa) and 'ca' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for eucalypti that I've seen before include "shrubs" , "Oil sources" , "Gum trees" , "Gums" , "Oil producers" .)

I've seen this clue in The Telegraph.
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