Colas I ordered for party (6)
I believe the answer is:
social
'party' is the definition.
(social is a kind of party)
'colas i ordered' is the wordplay.
'ordered' is an anagram indicator.
'colas'+'i'='colasi'
'colasi' anagrammed gives 'SOCIAL'.
'for' is the link.
(Other definitions for social that I've seen before include "Public servant caring for the underprivileged" , "Living in an organised community in Licosa" , "Pertaining to human relations" , "Enjoying companionship" , "Relating to society" .)