Crossword Genius

Servant kept making daughter run (8)

Ross

I believe the answer is:

retainer

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'servant' is the definition.
(I know that servant can be written as retainer)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for retainer that I've seen before include "Fee could be the answer" , "Down-payment for Eritrean" , "Long-standing family servant" , "Old servant - fee paid in advance" , "A money deposit or an old servant" .)

I've seen this clue in The Sunday Times.
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