Crossword Genius

Second centre in rugby? (4)

Ross

I believe the answer is:

back

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'second' is the definition.
(to second a motion is to back it)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for back that I've seen before include "Help!" , "part of the body" , "Support a play - player" , "bet" , "Rear; spine" .)

I've seen this clue in The Irish Times.
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