Suitably like diamonds? (3)
I believe the answer is:
red
'like diamonds?' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for red that I've seen before include "See it and become angry" , "Left-wing" , "'If you see it, perhaps you're angry (3)'" , "Bloodshot" , "Carmine" .)