Some card sent to colleagues (8)
I believe the answer is:
comrades
'colleagues' is the definition.
(I've seen this before)
'some card sent' is the wordplay.
'sent' indicates an anagram (send can mean to excite or stimulate).
'some'+'card'='somecard'
'somecard' is an anagram of 'COMRADES'.
'to' is the link.
(Other definitions for comrades that I've seen before include "Friends or fellow-workers" , "Friends, companions" , "Staunch companions, sometimes in arms" , "Associates" , "Colleagues" .)