Crossword Genius

Lacking capital, one paying for room and board (5)

Ross

I believe the answer is:

enter

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'board' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for enter that I've seen before include "Register (as a competitor)" , "Inscribe" , "Go/come in" , "Fruit drink" , "Move into" .)

I've seen this clue in The Sunday Times.
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