Chalked up line in grass (8)
I believe the answer is:
recorded
'chalked up' is the definition.
'line in grass' is the wordplay.
'line' becomes 'cord' (cord is a kind of line**).
'in' indicates putting letters inside.
'grass' becomes 'reed' (I've seen this before).
'cord' placed inside 'reed' is 'RECORDED'.
(Other definitions for recorded that I've seen before include "Set down in permanent form for later reference" , "Taped" , "Put on paper or tape" , "Registered electronically" , "reported?" .)