Inspiring figure's stuck in plug, unlike Victoria (6)
I believe the answer is:
amused
'inspiring figure's stuck' is the definition.
I can't judge whether this definition defines the answer.
'in plug unlike victoria' is the wordplay.
'in' is an insertion indicator.
'plug' becomes 'ad' (as in plugging a product).
'unlike victoria' becomes 'muse' (I am not sure about this - if you are sure you should believe this answer much more).
'ad' placed around 'muse' is 'AMUSED'.
Can you help me to learn more?
(Other definitions for amused that I've seen before include "Queen Victoria wasn't!" , "Medusa (anag)" , "Delighted" , "Made (someone) laugh" , "Provoked mirth in" .)