Way to circle tier (6)
I believe the answer is:
string
'tier' is the definition.
(I've seen this before)
'way to circle' is the wordplay.
'way' becomes 'st'.
'to circle' becomes 'ring' ('ring' can be a synonym of 'circle').
'st'+'ring'='STRING'
(Other definitions for string that I've seen before include "Series of events" , "yarn" , "Collective noun for racehorses trained together" , "It's difficult to know how long a piece of it is" , "train" .)