The plane mistaken for jumbo (8)
I believe the answer is:
elephant
'jumbo' is the definition.
(I've seen this before)
'the plane mistaken' is the wordplay.
'mistaken' is an anagram indicator.
'the'+'plane'='theplane'
'theplane' with letters rearranged gives 'ELEPHANT'.
'for' is the link.
(Other definitions for elephant that I've seen before include "See 18" , "Huge African or Indian animal" , "The symbol of the Republican Party" , "bigger one from two continents?" , "Large beast" .)