Initially works well as a cooking utensil (3)
I believe the answer is:
Here is my best explanation:
'a cooking utensil' is the definition.
(wok is a kind of cooking utensil)
'initially works well' is the subsidiary indication.
'initially' suggests taking the first letters.
'well' becomes 'ok' ('O.K.' can be a synonym of 'well').
The initial letter of 'works' is 'w'.
'as' is the link.
(Other definitions for wok that I've seen before include "Chinese cooking pan", "Chinese bowl-shaped frying pan", "Bowl-shaped pan", "Asian cooking pan", "pot", "Large Chinese frying pan", "Chinese cooking vessel like large bowl", "A Chinese large-bowled frying pan", "Pan used in Chinese cookery" and "Stir-fry pan".)