Crossword Genius

Sign an auditor’s letter (3)

Ross

I believe the answer is:

cue

'sign' is the definition.
(a cue is a sign or signal)

'an auditor's letter' is the wordplay.
'an auditor's' shows a homophone (sound like).
'letter' becomes 'q'.
'q' is a homophone of 'CUE'.

(Other definitions for cue that I've seen before include "Catchword" , "hit ball, in a way" , "Signal to players" , "Hint on stage" , "Snooker player's stick" .)

I've seen this clue in The Times and The Sunday Times.
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