Possible Clues:

• Cutting off oil giant's supply
• Cold-shouldering crooked oil giants
• One being critical about nothing, maintaining detachment?
• Keeping away from extremely tempting liaison diabolique
• Detaching, separating
• Leaving it alone to make it so Roman inside
• Stopping the contractions in hospital
• Thus it is classical in a way of leaving one alone
• Is to go back about the old tongue, and keeping it to itself
• Ligations (anag.)