One of the historic Marlborough team that helped found the RFU (5)

I believe the answer is:

nomad

(Other definitions for nomad that I've seen before include "one of those with no fixed home" , "Damon (anag.)" , "A member of a wandering tribe" , "someone who can't settle" , "Unsettled character" .)

I've seen this clue in The Times.

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