Crossword Genius

One first in but rarely last out! (6)

Ross

I believe the answer is:

opener

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'one first' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for opener that I've seen before include "First going in to bat" , "cricketer receiving the first ball?" , "Introductory remark" , "Card player who starts the bidding" , "Batsman who starts innings" .)

I've seen this clue in The Sun.
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