painter Klimt (6)
I believe the answer is:
gustav
'painter klimt' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gustav that I've seen before include "-- Mahler, symphonist" , "-- Holst; -- Mahler" , "- Holst, Eng. composer" , "Swede, perhaps" , "Perhaps Hertz" .)