Possible Clues:

• Opener in the middle affected pitch
• Unload, pitch tents, etc.
• Building with intent
• Pitch on field?
• Make a pitch: 'Hull's location is on the up, rather flamboyant'
• Set up a base
• Erect tents
• To pitch tents
• Pitch tents in French park, principally by river
• Pitch tents in spots put up by politician