Possible Clues:

• Unit of atmospheric pressure
• Air pressure unit
• I must be seen in factory watering-hole — there's a bit of pressure
• Atmospheric pressure unit
• Amount of pressure girl talked of at pub?
• Small unit of atmospheric pressure
• Tender a bill immediately, upholding a little pressure
• Little pressure for a bill I must back somewhat
• Amount of pressure girl talked of at pub
• Pressure unit