Security group getting nothing for so long (4)
I believe the answer is:
ciao
'so long' is the definition.
('goodbye' in Italian)
'security group getting nothing' is the wordplay.
'security group' becomes 'cia' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'getting' means one lot of letters go next to another.
'nothing' becomes 'O' (O resembles 0).
'cia'+'o'='CIAO'
'for' is the link.
Can you help me to learn more?
(Other definitions for ciao that I've seen before include "See you in Italy" , "Italian hello or goodbye" , "Informal greeting (Italian)" , "Italian salutation" , "Italian cheerio" .)