Segment of earnings (5)
I believe the answer is:
wedge
This clue might be a double definition.
'segment' is the first definition.
(thesaurus)
'earnings' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'of' is the link.
Can you help me to learn more?
(Other definitions for wedge that I've seen before include "piece of cake" , "V-sign" , "Chunk" , "Piece of wood thick at one end, thin at other" , "Slice" .)