Employ some ruses (3)
I believe the answer is:
use
'employ' is the definition.
(I know that employ can be written as use)
'some ruses' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'USE' can be found hidden inside 'ruses'.
(Other definitions for use that I've seen before include "Milk" , "Benefit" , "particular church liturgy" , "Manipulate" , "Value" .)