Evict the group at the start (6)
I believe the answer is:
outset
'the start' is the definition.
('outset' can be a synonym of 'start')
'evict the group' is the wordplay.
'evict' becomes 'ou' (I can't justify this - if you can you should give a lot more credence to this answer).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'group' becomes 'set' (both can mean a collection).
'ou'+'t'+'set'='OUTSET'
'at' is the link.
Can you help me to learn more?
(Other definitions for outset that I've seen before include "debut?" , "Opening stage" , "launch" , "Inception" , "Kickoff time?" .)