Captain Edgar's hollow tree (5)

I believe the answer is:

cedar

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'tree' is the definition.
(cedar tree is a kind of tree)

'captain edgar's hollow' is the wordplay.
'captain' becomes 'c' (this might be a standard abbreviation of which I'm unaware).
'hollow' suggests removing the centre (the word is hollowed out).
'edgar' with its centre removed is 'edar'.
'c'+'edar'='CEDAR'

Can you help me to learn more?

(Other definitions for cedar that I've seen before include "Raced around noble tree" , "representative of Lebanon?" , "Leaving body" , "Raced around a mighty tree" , "Evergreen tree" .)

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

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