Political meeting (5)
'political meeting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rally that I've seen before include "Assemble - recover" , "Recover; mass meeting" , "Arouse for action" , "motoring event" , "Mass political meeting" .)
'political meeting' is the definition.
(type of meeting in US politics)
This is all the clue.
(Other definitions for caucus that I've seen before include "Small group of like-minded politicians" , "Small dominant inner group" , "Meeting to select a political candidate in the US" , "Political grouping" , "Political gathering to select a candidate, US-style" .)