Note, very large (3)
I believe the answer is:
sol
'note' is the definition.
(I've seen this before)
'very large' is the wordplay.
'very' becomes 'so' (I've seen this in other clues).
'large' becomes 'l'.
'so'+'l'='SOL'
(Other definitions for sol that I've seen before include "Note; Peruvian currency" , "Roman sun-god" , "Spanish and poetic sun" , "The sun in Spain" , "nearby star" .)