Stroke new sheets (5)
I believe the answer is:
linen
'sheets' is the definition.
(I've seen this before)
'stroke new' is the wordplay.
'stroke' becomes 'line' (stroke can mean a line or bar).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'line'+'n'='LINEN'
(Other definitions for linen that I've seen before include "sheets, perhaps" , "Cloth woven flax fibres" , "Fabric woven from flax fibres" , "E.g. bedclothes" , "Flax yarn" .)