Like a flush in hearts or diamonds (3)
I believe the answer is:
red
'like' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?
'a flush in hearts or diamonds' is the wordplay.
I cannot really see how this works, but
'diamonds' could be 'd' (abbreviation in bridge say) and 'd' is present in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for red that I've seen before include "Bordeaux claret, for instance" , "Colour of garnets" , "Colour of a cardinal's hat" , "eg Cardinal" , "Flushed" .)