See you acclaim icon regularly (7)
I believe the answer is:
cheerio
'see you' is the definition.
(I've seen this before)
'acclaim icon regularly' is the wordplay.
'acclaim' becomes 'cheer' (I've seen this before).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'icon' are 'io'.
'cheer'+'io'='CHEERIO'
(Other definitions for cheerio that I've seen before include "Expression used when leaving" , "Ta-ta" , "British romance imprint" , "Informal goodbye, sounds blithe" , "An informal hearty goodbye" .)