Exceptionally large and majestic (5)
I believe the answer is:
regal
'majestic' is the definition.
(I know that majestic can be written as regal)
'exceptionally large' is the wordplay.
'exceptionally' is an anagram indicator.
'large' is an anagram of 'REGAL'.
'and' acts as a link.
(Other definitions for regal that I've seen before include "King-like" , "Kingly glare?" , "Magnificent, dignified" , "King's" , "Royal - 5 down (anag)" .)