OK; halt, girl, twist (3,5)
I believe the answer is:
all right
'ok' is the definition.
(synonyms)
'halt girl twist' is the wordplay.
'twist' indicates anagramming the letters (a twisted or distorted version of the letters).
'halt'+'girl'='haltgirl'
'haltgirl' with letters rearranged gives 'ALL-RIGHT'.
(Other definitions for all right that I've seen before include "none left" , "Safe - adequate" , "Very well, as you wish" , "Completely one-sided" , "Of acceptable quality" .)