____ of signals, junior naval rating (6)

I believe the answer is:

yeoman

(Other definitions for yeoman that I've seen before include "(Of old) a free person cultivating his own land" , "Officer in the bodyguard of the British monarch" , "Historically, English freeholders and footsoldiers" , "One guarding" , "Warder of the Tower of London" .)

I've seen this clue in The Sunday Times.

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