Crossword Genius

One having trunk in the plane possibly (8)

Ross

I believe the answer is:

elephant

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

'one having trunk' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'the plane possibly' is the wordplay.
'possibly' is an anagram indicator.
'the'+'plane'='theplane'
'theplane' anagrammed gives 'ELEPHANT'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for elephant that I've seen before include "Large animal (in the room?)" , "Trumpeter" , "Large land mammal" , "Then leap (anag.)" , "Largest land mammal" .)

I've seen this clue in The Sun.
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