Talk or get into a mess (7)
I believe the answer is:
oration
'talk' is the definition.
(I've seen this in another clue)
'or get into a mess' is the wordplay.
'get' means one lot of letters go next to another.
'mess' indicates anagramming the letters.
'into'+'a'='intoa'
'intoa' is an anagram of 'ation'.
'or'+'ation'='ORATION'
(Other definitions for oration that I've seen before include "A long ceremonial speech" , "Ontario (anag)" , "Platform speech" , "Making a speech" , "words" .)