Get about within hail (5)
I believe the answer is:
greet
'hail' is the definition.
(thesaurus)
'get about within' is the wordplay.
'about' becomes 're' (regarding**).
'within' indicates putting letters inside.
'get' going around 're' is 'GREET'.
(Other definitions for greet that I've seen before include "Give welcome to" , "Welcome; cry (Scots)" , "Address on arrival, say hello" , "Egret (anag.)" , "Acknowledge" .)