Training guilt on us is tacky (9)
I believe the answer is:
glutinous
'tacky' is the definition.
(thesaurus)
'training guilt on us' is the wordplay.
'training' indicates an anagram (to train can mean to grow something into a shape).
'guilt'+'on'='guilton'
'guilton' is an anagram of 'glutino'.
'glutino'+'us'='GLUTINOUS'
'is' is the link.
(Other definitions for glutinous that I've seen before include "Sticky" , "not easy to shake off?" .)