Bit of a stare from Jack (3)
I believe the answer is:
tar
'jack' is the definition.
(thesaurus)
'bit of a stare from' is the wordplay.
'bit of' says the answer is hidden in the clue.
'TAR' is hidden within 'stare from'.
(Other definitions for tar that I've seen before include "It may cover the road" , "Naval man" , "Liquid from wood, coal" , "Road-making substance" , "Product of coal" .)