Reveal what inspires painting by one in Paris (7)
I believe the answer is:
'reveal' is the definition.
(I know this)
'what inspires painting by one in paris' is the wordplay.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'inspires' indicates putting letters inside (inspire means to breathe in).
'painting' becomes 'art' (painting is an art).
'by' says to put letters next to each other.
'one in paris' becomes 'un' ('one' in French).
'eh' placed around 'art' is 'earth'.
'earth' after 'un' is 'UNEARTH'.
(Other definitions for unearth that I've seen before include "reveal" , "Bring out of obscurity" , "Track down" , "Cut a certain wire" , "Dig up for a hunter" .)