Disgruntled six-footer follows quarry entering pub (9)
I believe the answer is:
indignant
'disgruntled' is the definition.
(thesaurus)
'six-footer follows quarry entering pub' is the wordplay.
'six footer' becomes 'ant' (an ant has six feet).
'follows' says to put letters next to each other.
'quarry' becomes 'dig' (quarry can mean to dig).
'entering' indicates putting letters inside.
'pub' becomes 'inn' (an inn is a type of pub).
'dig' placed into 'inn' is 'indign'.
'ant' put after 'indign' is 'INDIGNANT'.
(Other definitions for indignant that I've seen before include "Angered by unjust treatment" , "Taking umbrage" , "somewhat angry" , "Ruffled" , "not happy" .)