Push in untried contraption (7)
I believe the answer is:
intrude
'push in' is the definition.
(I've seen this before)
'untried contraption' is the wordplay.
'contraption' is an anagram indicator.
'untried' anagrammed gives 'INTRUDE'.
(Other definitions for intrude that I've seen before include "Break in" , "Come in uninvited" , "Come in when not wanted" , "Poke one's nose in" , "Put forward" .)