Secure rugby player (4)

I believe the answer is:

lock

I believe this clue is a double definition.

'secure' is the first definition.
(locking is a kind of securing)

'rugby player' is the second definition.
(position in rugby)

(Other definitions for lock that I've seen before include "Hold < wisp of wool" , "Security device - tuft of hair" , "temporary container for lighter, say" , "Secure a piece of hair" , "Become immoveable" .)

I've seen this clue in The Daily Express.

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