Crossword Genius

Promise of ketchup at last appearing on shelf (6)

Ross

I believe the answer is:

pledge

'promise' is the definition.
(pledging is a kind of promising)

'ketchup at last appearing on shelf' is the wordplay.
'at last' suggests the final letters.
'appearing on' is a charade indicator (letters next to each other).
'shelf' becomes 'ledge' (synonyms).
The last letter of 'ketchup' is 'p'.
'p'+'ledge'='PLEDGE'

'of' acts as a link.

(Other definitions for pledge that I've seen before include "assurance", "Give one's word", "Covenant", "Plight", "make toast".)

I've seen this clue in The Telegraph.
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