Bearing rocks, enter with some force (5,2)
'enter with some force' is the definition.
(to barge in is to forcibly enter a place)
'bearing rocks' is the wordplay.
'rocks' indicates an anagram.
'bearing' with letters rearranged gives 'BARGE IN'.
(Other definitions for barge in that I've seen before include "Rudely interrupt", "Unexpectedly enter", "Enter uninvited", "Rudely intrude", "Gate-crash, break into a conversation".)