Possible Clues:

• Push finger in 'er nose? There's no expression for that
• Impassive visage as employed by card gambler
• That's no expression to make you stick your finger in her eye, by the sound of it
• No expression is needed to stick your finger in 'er eye, it seems
• Expressionless visage, useful when playing cards
• Countenance giving nothing away
• Without 2 across this might give one the look of being in the fire
• Cope with freak storm? An aspect of self-control
• Asset at the card table
• Blank countenance when not wishing to give anything away