Accountant heads for Uruguay, Columbia and America from political meeting (6)
I believe the answer is:
Here is my best explanation:
'political meeting' is the definition.
(I've seen this before)
'accountant heads for uruguay columbia and america' is the subsidiary indication.
'accountant' becomes 'ca' (abbreviation for chartered accountant).
'heads for' suggests taking the first letters (I've seen 'head for' mean this).
'and' is a charade indicator (letters next to each other).
'america' becomes 'us' (abbreviation for the United States).
The initial letters of 'uruguay columbia' is 'uc'.
'from' is the link.
(Other definitions for caucus that I've seen before include "Meeting of party leaders", "Closed political meeting", "Small, dominant political group", "Political gathering to select a candidate, US-style", "Assembly, conclave", "Small dominant inner group", "(US) party meeting", "Group with shared concerns within a political party", "Party meeting" and "Policy meeting".)