Greatly inspiring northern artist (5)
I believe the answer is:
munch
'artist' is the definition.
(painter Edvard Munch)
'greatly inspiring northern' is the wordplay.
'greatly' becomes 'much' (I've seen this in another clue).
'inspiring' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'much' enclosing 'n' is 'MUNCH'.
(Other definitions for munch that I've seen before include "Edvard -, Norwegian artist (The Scream)" , "He depicted" , "who's popular in the gallery?" , "champ" , "Eat audibly; painter" .)