Chord composed of criminal elements (5)
I believe the answer is:
triad
This could be a double definition.
'chord' is the first definition.
(I know that triad is a type of chord)
'criminal elements' is the second definition.
I know that 'criminal' relates to this answer. I also know that both the answer and definition are singular nouns
'composed of' is the link.
Can you help me to learn more?
(Other definitions for triad that I've seen before include "Could be major" , "Criminals" , "Chinese secret society" , "trio" , "Set of three; chord" .)