Breathcontrol

2 clues
Voice coach's concern
Singing skill that enables good phrasing
Similar answers:
Abreath
Accostcontrols
Adaptivecontrol
Admissioncontrol
Astercontrol
Babysbreath
Badbreath
Badbreathandbeyond
Baitedbreath
Ballcontrol
Batedbreath
Behaviorcontrol
Beringundercontrol
Bertcontrol
Berthcontrol
Birthcontrol
Breath
Breathalysed
Breathalyser
Breathalyzer