Barge in cut transporting lost crate (9)
I believe the answer is:
gatecrash
'barge in' is the definition.
(synonyms)
'cut transporting lost crate' is the wordplay.
'cut' becomes 'gash' (a gash is a wound or cut).
'transporting' is an insertion indicator.
'lost' is an anagram indicator.
'crate' with letters rearranged gives 'tecra'.
'gash' placed around 'tecra' is 'GATECRASH'.
(Other definitions for gatecrash that I've seen before include "to do so uninvited" , "enter without invitation" , "join party unofficially" , "join party if not wanted" , "Try to get in for free" .)