Passion of Cook to secure uniform (4)
I believe the answer is:
fury
'passion' is the definition.
(thesaurus)
'cook to secure uniform' is the wordplay.
'cook' becomes 'fry' (frying is a kind of cooking).
'to secure' means one lot of letters goes inside another (inserted letters are secured inside).
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'fry' going around 'u' is 'FURY'.
'of' is the link.
(Other definitions for fury that I've seen before include "Extreme anger" , "Violent rage" , "Vengeful deity" , "'Hell hath no . . . . like a woman scorned" , "Extreme rage" .)