Turn clockwise, as a screw (7)
I believe the answer is:
tighten
(Other definitions for tighten that I've seen before include "Stiffen" , "Make harder to undo" , "Make less loose" , "Do this to your belt to economise (7)" , "get tense" .)
I believe the answer is:
tighten
(Other definitions for tighten that I've seen before include "Stiffen" , "Make harder to undo" , "Make less loose" , "Do this to your belt to economise (7)" , "get tense" .)