King hates fancy red suit (6)
I believe the answer is:
Here is my best explanation:
'red suit' is the definition.
(I've seen this before)
'king hates fancy' is the subsidiary indication.
'king' becomes 'r' (r is abbreviation for rex).
'fancy' indicates anagramming the letters.
'rhates' is an anagram of 'hearts'.
(Other definitions for hearts that I've seen before include "Suit of cards", "Vital organs in the pack", "Cores", "Vital suit", "Playing-card suit", "Scottish footballers", "They beat", "Edinburgh football team - suit", "Red suit" and "Centres".)