Shawl auntie regularly used for greeting (6)
I believe the answer is:
salute
'for greeting' is the definition.
(salute is a kind of greeting)
'shawl auntie regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'shawl'+'auntie'='shawlauntie'
The alternate letters of 'shawlauntie' are 'SALUTE'.
'used' is the link.
(Other definitions for salute that I've seen before include "Hail with a gesture" , "Mark" , "Hail, greet" , "Gunfire, perhaps" , "Honour" .)