Spike delicate material (4)
I believe the answer is:
lace
I believe this clue is a double definition.
'spike' is the first definition.
(I know that spike can be written as lace)
'delicate material' is the second definition.
(I've seen this before)
(Other definitions for lace that I've seen before include "Delicate open-web fabric" , "Fine open fabric" , "Famous play ''Arsenic and Old . . . .''" , "Tear" , "Shoe tie" .)