Performing bears about to leave coastal state (6)
I believe the answer is:
Here is my best explanation:
'coastal state' is the definition.
'performing bears about to leave' is the subsidiary indication.
'performing' becomes 'on' (I've seen this in other clues).
'bears' is an insertion indicator.
'about' becomes 're' (common abbreviation for 'with reference to'**).
'to leave' becomes 'go'.
'on' going around 'rego' is 'oregon'.
(Other definitions for oregon that I've seen before include "The "Beaver State"", "West coast US state", "US NW coastal state", "US region", "American state, capital Salem (6).", "Gooner (anag) - US state", "A NW US state", "No gore in this western American state", "America's Beaver State" and "US north-western coastal state".)