Possible Clues:

• Boater
• Summer headwear
• Such as succeeds theatre etc given a turn off-Broadway in June?
• Farmer's topper
• Growths come back with what goes on ahead for the boater
• Sort of trick tried on sucker in Panama
• E.g. boater
• Headgear Tsar sported, eh?
• Boater, for one
• Headgear for the sun