Crossword Genius

He keeps a servant (8)

Ross

I believe the answer is:

retainer

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'servant' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for retainer that I've seen before include "Long-standing family servant" , "Eritrean (anag)" , "Fee paid to secure services" , "reduced rent" , "Household servant (often faithful and old!)" .)

I've seen this clue in The Globe and Mail.
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