Operating

1 clue
___ running
Similar answers:
Aaarating
Aattheopera
Abating
Abbreviating
Accommodating
Actuating
Adulating
Advocating
Aerating
Aeroperu
Aggravating
Agitating
Airplaneseating
Alicecooper
Alienating
Allatingle
Allocating
Alternatingcurrent
Ambulating
Andersoncooper