Broad changes with latch and barrier (9)
I believe the answer is:
roadblock
'barrier' is the definition.
(I know that barrier can be written as roadblock)
'broad changes with latch' is the wordplay.
'changes' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'latch' becomes 'lock' (I can't justify this - if you can you should believe this answer much more).
'broad' with letters rearranged gives 'roadb'.
'roadb'+'lock'='ROADBLOCK'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for roadblock that I've seen before include "put in place by police after fugitive" , "Barrier constructed by police" , "Barrier on way" , "Traffic-halting barrier" , "Barrier to traffic" .)