Fit of wild pique (5)
I believe the answer is:
equip
'fit' is the definition.
(I know that fit can be written as equip)
'wild pique' is the wordplay.
'wild' indicates anagramming the letters.
'pique' is an anagram of 'EQUIP'.
'of' acts as a link.
(Other definitions for equip that I've seen before include "Arm" , "Furnish with requirements" , "Supply with what is needed" , "Furnish with supplies" , "Give kit to" .)