Agitated UN tried to meddle (7)
I believe the answer is:
intrude
'meddle' is the definition.
(I've seen this before)
'agitated un tried' is the wordplay.
'agitated' indicates an anagram.
'un'+'tried'='untried'
'untried' is an anagram of 'INTRUDE'.
'to' acts as a link.
(Other definitions for intrude that I've seen before include "meddle" , "Come in uninvited" , "Put forward" , "Trespass" , "Stick one's nose in" .)