Arousing stuff? No good shunning lusting - I’m aroused (7)
I believe the answer is:
stimuli
'arousing stuff?' is the definition.
(a stimulus arouses or excites someone)
'no good shunning lusting i'm aroused' is the wordplay.
'no good' becomes 'ng' (abbreviation).
'shunning' indicates named letters should be taken away.
'aroused' indicates anagramming the letters (letters roused or stirred up into a new form).
'lusting'+'im'='lustingim'
'lustingim' with 'ng' removed is 'lustiim'.
'lustiim' is an anagram of 'STIMULI'.
(Other definitions for stimuli that I've seen before include "Things that produce a response" , "Rousing influences" , "Things promoting activity" , "They arouse to action" , "Activity inducers" .)