Crossword Genius

Mark Fox turns up (3)

Ross

I believe the answer is:

dot

'mark' is the definition.
(dotting is a kind of marking)

'fox turns up' is the wordplay.
'fox' becomes 'tod' (historic term).
'turns up' is a reversal indicator.
'tod' in reverse letter order is 'DOT'.

(Other definitions for dot that I've seen before include "A point, small round mark" , "Little girl" , "'Spot, tiny mark (3)'" , "scatter" , "One signal used in Morse code" .)

I've seen this clue in The Times.
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