Sure to use small tricks (5)
I believe the answer is:
ruses
'tricks' is the definition.
(a ruse is a trick or ploy)
'sure to use small' is the wordplay.
'to use' indicates anagramming the letters (I've seen 'using' mean this (the letters used in a different way)).
'small' becomes 's' (abbreviation - e.g. clothes size).
'sure' anagrammed gives 'ruse'.
'ruse'+'s'='RUSES'
(Other definitions for ruses that I've seen before include "Tricks or deceptions" , "Dodges" , "'Stratagems, tricks (5)'" , "Cunning plans" , "Clever plans designed to deceive" .)