Drawing upon (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
using
'drawing upon' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for using that I've seen before include "addiction" , "Utilising" , "practice" , "Putting to a particular purpose" , "Exploiting for one's own advantage" .)