Second version of these lines (6)
I believe the answer is:
sheets
'lines' is the definition.
(sheet is a kind of line)
'second version of these' is the wordplay.
'second' becomes 's' (common abbreviation).
'version of' indicates anagramming the letters (another version of the same letters).
'these' is an anagram of 'heets'.
's'+'heets'='SHEETS'
(Other definitions for sheets that I've seen before include "Bed coverings for the sailor's ropes" , "She set them on the bed" , "Sail-ropes and bedclothes" , "Bed covers" , "Leaves" .)