Crossword Genius

Slashes substantial incomes, primarily (6)

Ross

I believe the answer is:

solidi

'slashes' is the definition.
('solidus' can be a synonym of 'slash')

'substantial incomes primarily' is the wordplay.
'substantial' becomes 'solid' ('solid' can be a synonym of 'substantial').
'primarily' says to take the initial letters.
The first letter of 'incomes' is 'i'.
'solid'+'i'='SOLIDI'

(Other definitions for solidi that I've seen before include "Slashes" , "Oblique strokes" , "old gold coins" .)

I've seen this clue in The Times.
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