Crossword Genius

Reasons chartered accountant employs (6)

Ross

I believe the answer is:

causes

'reasons' is the definition.
(the reasons for something)

'chartered accountant employs' is the wordplay.
'chartered accountant' becomes 'CA' (abbreviation for chartered accountant).
'employs' becomes 'uses' ('use' can be a synonym of 'employ').
'ca'+'uses'='CAUSES'

(Other definitions for causes that I've seen before include "'Reasons, grounds (6)'" , "Origins or crusaders" , "See 5" , "Reasons why things happen" , "They bring about effects" .)

I've seen this clue in The Guardian.
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