I'll just have a glass of...

Meaning

I will only have one glass of...

Examples

• John: '<b>I'll just have a glass of</b> Pinot Grigio.'<br>
• Alice: 'Certainly, sir.'
• John: 'Yes, please. <b>I'll just have a glass of</b> red wine.'
• Alice: 'Would you like some wine?'<br>