Pavlova left over, son records (6)
I believe the answer is:
annals
'records' is the definition.
(I've seen this before)
'pavlova left over son' is the wordplay.
'pavlova' becomes 'anna' (I've seen this in another clue).
'left' becomes 'l' (common abbreviation).
'over' is a charade indicator (letters next to each other) (in a down clue, some letters go over others).
'son' becomes 's' (genealogical abbreviation for son).
'anna'+'l'+'s'='ANNALS'
(Other definitions for annals that I've seen before include "Registers" , "Tomorrow (Spanish)" , "Chronological records, yearbooks" , "Archives" , "Historical records" .)