Sixfold (8)
I believe the answer is:
sextuple
'sixfold' is the definition.
(I know that sixfold can be written as sextuple)
This is the entire clue.
(Other definitions for sextuple that I've seen before include "Multiply by six" , "Like several" , "Adjective meaning sixfold" , "A sixfold quantity" , "Multiplied by six" .)