Crossword Genius

On completion produces key (6)

Ross

I believe the answer is:

legend

'key' is the definition.
(thesaurus)

'on completion' is the wordplay.
'on' becomes 'leg' (cricket term, fielding positions).
'completion' becomes 'end' (I've seen this before).
'leg'+'end'='LEGEND'

'produces' acts as a link.

(Other definitions for legend that I've seen before include "Very famous member's death" , "Stanley Matthews, perhaps" , "Inscription; myth" , "explanation" , "Old tale" .)

I've seen this clue in The Telegraph.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.