Crossword Genius

Mrs Hall’s boy? (4)

Ross

I believe the answer is:

mark

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'boy?' is the definition.

I don't understand the remainder of the clue.

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(Other definitions for mark that I've seen before include "Former German currency" , "Scar; note" , "religious work of a saint" , "that's no longer legal currency in Europe" , "Starting point in race" .)

I've seen this clue in the Evening Standard.
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