Related Clues:

• Succession, order
• Extent of a two-dimensional surface
• Space for a specific purpose, say picnic
• The measure of a surface
• Fish from the corner
• Fish from the corner?
• Space between two lines where they intersect
• Field of activity or surface
• The space between two lines that intersect
• 'Tract, region (4)'
• The A.A. might be round about this, and that's about the size of it
• The region where there is more ventilation, by the sound of it
• That would be a fishy way to get your degrees
• Cast a fly 35 across
• What a fishy way to behave! It's all a matter of degree