Principally (7)
'principally' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for largely that I've seen before include "In the main" , "Allergy (anag.)" , "Principally" , "Mostly found in gallery" , "as a rule" .)
'principally' is the definition.
(synonyms)
This is all the clue.
(Other definitions for chiefly that I've seen before include "In the main" , "Mainly, principally" , "For the most part" .)