Crossword Genius

Mail coach instrument (4,4)

Ross

I believe the answer is:

post horn

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mail coach instrument</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for post horn that I've seen before include "Instrument once sounded on journey" , "Mail coach instrument" .)

I've seen this clue in The Times.
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