Right mate, let's get together! (5)
I believe the answer is:
rally
'get together' is the definition.
(rallying is a kind of getting together)
'right mate' is the wordplay.
'right' becomes 'r' (common abbreviation).
'mate' becomes 'ally' (I've seen this before).
'r'+'ally'='RALLY'
'let's' acts as a link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for rally that I've seen before include "Mass political meeting" , "Recover health" , "Recuperate in gathering" , "several shots" , "Bring together for a purpose, troops perhaps" .)