The plane trips apparently one never forgets (8)
I believe the answer is:
elephant
'apparently one never forgets' is the definition.
(supposedly, elephants never forget)
'the plane trips' is the wordplay.
'trips' indicates anagramming the letters.
'the'+'plane'='theplane'
'theplane' is an anagram of 'ELEPHANT'.
(Other definitions for elephant that I've seen before include "Trunk on one" , "Get this animal from Pat and Helen" , "Then leap (anag.)" , "The animal that never forgets" , "Large pachyderm" .)