Dutch painting is flash (4)
I believe the answer is:
dart
'is flash' is the definition.
(I've seen this before)
'dutch painting' is the wordplay.
'dutch' becomes 'd' (common abbreviation).
'painting' becomes 'art' (I've seen this before).
'd'+'art'='DART'
(Other definitions for dart that I've seen before include "Shoot out" , "One fired" , "Dash; pointed missile" , "Run suddenly" , "shift fast" .)