Green is bad -- source of emotional charge! (8)
I believe the answer is:
energise
'charge' is the definition.
('charge'->'energize' is in my internal thesaurus and 'ize'->'ise')
'green is bad source of emotional' is the wordplay.
'bad' indicates an anagram.
'source of' indicates taking the first letters.
The first letter of 'emotional' is 'e'.
'green'+'is'='greenis'
'greenis' anagrammed gives 'energis'.
'energis'+'e'='ENERGISE'
(Other definitions for energise that I've seen before include "Stimulate activity" , "To banish inertia" , "Give active force" , "Give vitality to" , "Give power to" .)