Quietly coming upon exotic arboreal creature (5,4)

I believe the answer is:

polar bear

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'creature' is the definition.
(I've seen this before)

'quietly coming upon exotic arboreal' is the wordplay.
'quietly coming' becomes 'p' (I am not sure about this - if you are sure you should believe this answer much more).
'upon' is a charade indicator (letters next to each other).
'exotic' is an anagram indicator.
'arboreal' is an anagram of 'olarbear'.
'p'+'olarbear'='POLAR BEAR'

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(Other definitions for polar bear that I've seen before include "Beast of the Arctic" , "big brute" , "Largest carnivorous land mammal" , "Arctic creature" , "Arctic pack ice resident" .)

I've seen this clue in The Telegraph.

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