It's lengthened for point, ten, and looked after (8)
I believe the answer is:
extended
'it's lengthened' is the definition.
(extending is a kind of lengthening)
'point ten and looked after' is the wordplay.
'point' becomes 'E' (compass point).
'ten' becomes 'X' (Roman numeral).
'and' means one lot of letters go next to another.
'looked after' becomes 'tended' (tending is a kind of looking after).
'e'+'x'+'tended'='EXTENDED'
'for' is the link.
(Other definitions for extended that I've seen before include "Lengthy" , "Reached out for next deed" , "Prolonged, lengthened" , "Protracted, elongated" , "Stretched, drew out" .)