Possible Clues:

• Hospital-wise 3 is go
• Working European organ regularly used in voluntary
• Working is voluntary over period of time
• Ready for action
• Time filled in discretionary working
• Working time's voluntary outside
• Running is not compulsory, taking in a long period
• Working out initially sensible following PE
• Working to create a large base for theatre event
• Begin (don't finish) with reason in working order