Subsequent tear opening in spun material (5)
I believe the answer is:
later
'subsequent' is the definition.
(similar in meaning)
'tear opening in spun material' is the wordplay.
'opening' says to take the initial letters.
'in' means one lot of letters goes inside another.
'spun' says the letters should be written in reverse.
'material' becomes 'real' (associated in meaning).
The first letter of 'tear' is 't'.
'real' backwards is 'laer'.
't' put within 'laer' is 'LATER'.
(Other definitions for later that I've seen before include "At some time afterwards" , "Tardier" , "Following" , "In due course" , "more modern" .)