Interfere - and get decoration, say (6)
I believe the answer is:
meddle
'interfere' is the definition.
(I know that meddle is a more specific form of the action interfere)
'decoration say' is the wordplay.
'decoration' becomes 'medal' (synonyms).
'say' indicates a 'sounds like' (homophone) clue.
'medal' sounds like 'MEDDLE'.
'and get' is the link.
(Other definitions for meddle that I've seen before include "Tamper, tinker" , "Mess with" , "Pink Floyd album" , "Interfere in people's affairs" , "Potter" .)