Servant girl has right implement (6)
I believe the answer is:
wrench
'implement' is the definition.
(wrench is a kind of implement)
'servant girl has right' is the wordplay.
'servant girl' becomes 'wench' (I've seen this before).
'has' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'wench' going around 'r' is 'WRENCH'.
(Other definitions for wrench that I've seen before include "Sort of spanner - twist it" , "Twisting tool" , "Violent twist; tool" , "Jerky pulling movement" , "Yank" .)