Mark date for extraction (7)
I believe the answer is:
lineage
'for extraction' is the definition.
(I've seen this in another clue)
'mark date' is the wordplay.
'mark' becomes 'line' (lining is a kind of marking).
'date' becomes 'age' (both can mean to get older).
'line'+'age'='LINEAGE'
(Other definitions for lineage that I've seen before include "Ancestral line as seen in eagle" , "Ancestry, sequence of descendants" , "Stock" , "Old family members" , "Genealogy" .)