Entertain a source of inspiration (5)
I believe the answer is:
amuse
'entertain' is the definition.
(amuse can mean to entertain or divert)
'a source of inspiration' is the wordplay.
'source of inspiration' becomes 'muse' (I've seen this in another clue).
'a'+'muse'='AMUSE'
(Other definitions for amuse that I've seen before include "Delight" , "Divert or entertain mildly" , "interest" , "Make (someone) laugh" , "Keep someone entertained" .)