Crossword Genius

Start chess, ultimately, with pawn (5)

Ross

I believe the answer is:

shock

'start' is the definition.
(thesaurus)

'chess ultimately with pawn' is the wordplay.
'ultimately' indicates one should take the final letters.
'with' is a charade indicator (letters next to each other).
'pawn' becomes 'hock' (hock can mean to pawn an item at a pawnbroker's).
The last letter of 'chess' is 's'.
's'+'hock'='SHOCK'

(Other definitions for shock that I've seen before include "Unpleasant surprise" , "Appal" , "Stun" , "Horrify - stroke" , "old dog is > sixty!" .)

I've seen this clue in The Guardian.
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