Increased shame is difficult to control (6)
I believe the answer is:
uppity
'difficult to control' is the definition.
(uppity can mean arrogant or obstinate)
'increased shame' is the wordplay.
'increased' becomes 'up' (something that's up has increased or risen).
'shame' becomes 'pity' (synonyms).
'up'+'pity'='UPPITY'
'is' acts as a link.
(Other definitions for uppity that I've seen before include "Cheeky or presumptuous" , "Informally pert or arrogant" , "Difficult to control" , "Full of oneself" , "Needing to be slapped down?" .)