Decuple (7)
I believe the answer is:
tenfold
'decuple' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tenfold that I've seen before include "An order of magnitude as much" , "(Multiplied) by putting 0 on end" , "several times" , "(Increased) by an order of magnitude" , "x10" .)