American who drew game, with both sides full of energy (8)
I believe the answer is:
whistler
'american who drew' is the definition.
(artist James Abbott McNeill Whistler)
'game with both sides full of energy' is the wordplay.
'game' becomes 'whist' (whist is a card game).
'with' means one lot of letters go next to another.
'both sides' becomes 'LR' (abbreviation for left and right).
'full of' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mch).
'lr' placed around 'e' is 'ler'.
'whist'+'ler'='WHISTLER'
(Other definitions for whistler that I've seen before include "James --, US artist" , "Artist who painted his mother in 1871" , "American painter, 1834-1903" , "old kettle, say" , "English painter or mouth musician" .)