A possible producer of a Peck title some knocked (9)
'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" .)
But I've got no explanation for this one! Could you help me understand?
(Other definitions for mistletoe that I've seen before include ""Kissing" sprig" , "Christmas berry" , "Kissed-under plant" , "Parasitic shrub for Christmas" , "Parasitic plant" .)