Family finding range on time (7)
I believe the answer is:
lineage
'family' is the definition.
(I know that lineage is a type of family)
'range on time' is the wordplay.
'range' becomes 'line' (I've seen this in other clues).
'on' means one lot of letters go next to another.
'time' becomes 'age' (an age is a period of time).
'line'+'age'='LINEAGE'
'finding' is the link.
(Other definitions for lineage that I've seen before include "Line of descendants of an ancestor" , "Direct descent" , "Pedigree, family tree" , "Descent from ancestors" , "Old family members" .)