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A possible producer of a Peck title some knocked (9)

Ross

I think it could be either:

operative

mistletoe
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'a possible producer' is the definition.
'operative' can be an answer for 'producer' (thesaurus). I am unsure of the 'a possible' bit.

'of a peck title some knocked' is the wordplay.
'of' becomes 'o''.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'peck title' becomes 'evita' (I can't justify this - if you can you should believe this answer much more).
'some knocked' shows that the letters should be reversed in order (I've seen 'knocking' mean this).
'evita' reversed gives 'ative'.
'o'+'per'+'ative'='OPERATIVE'

Can you help me to learn more?

(Other definitions for operative that I've seen before include "Machinist - working" , "Having force - skilled worker" , "undercover agent" , "secret agent" , "Efficient" .)

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