Delight in artist with power over hearts (6)
I believe the answer is:
ravish
'delight' is the definition.
(I know that delight can be written as ravish)
'artist with power over hearts' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'with' means one lot of letters go next to another.
'power' becomes 'vis' (I have seen 'Roman power' mean 'vis' so perhaps 'power' could also mean 'vis').
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'hearts' becomes 'h' (abbreviation used in card games e.g. bridge).
'ra'+'vis'+'h'='RAVISH'
'in' acts as a link.
(Other definitions for ravish that I've seen before include "Seduce" , "Seize and carry off" , "Enrapture - sexually assault" , "Hold spellbound" , "Transport with delight" .)