Answer: aceinthehole

AnswerCrossword Clue
ACEINTHEHOLE

Sure thing

ACEINTHEHOLE

Hidden advantage

ACEINTHEHOLE

Resource in reserve

ACEINTHEHOLE
Secret advantage
ACEINTHEHOLE
Effective resource held in reserve: Colloq.
ACEINTHEHOLEHidden asset.
ACEINTHEHOLEResource of a kind.
ACEINTHEHOLEKirk Douglas film: 1951
ACEINTHEHOLESecret weapon
ACEINTHEHOLEEcstatic golfer's shout?
ACEINTHEHOLEHidden resource