Used teeth on right rope (6)
I believe the answer is:
tether
'rope' is the definition.
(I've seen this before)
'used teeth on right' is the wordplay.
'used' indicates an anagram.
'on' means one lot of letters go next to another.
'right' becomes 'r' (common abbreviation).
'teeth' with letters rearranged gives 'tethe'.
'tethe'+'r'='TETHER'
(Other definitions for tether that I've seen before include "Restrictive rope fixed to one spot" , "Rope for tying animal" , "Tie up with a rope, an animal perhaps" , "lead" , "Rope holding an animal" .)