Mock judge always (4)
I believe the answer is:
jeer
'mock' is the definition.
(thesaurus)
'judge always' is the wordplay.
'judge' becomes 'j'.
'always' becomes 'eer' (poetic way of saying ever).
'j'+'eer'='JEER'
(Other definitions for jeer that I've seen before include "Tease" , "Mock rudely" , "Catcall" , "Call out derisively" , "Mock publicly" .)