Related Clues:

• Surprise, confuse
• Drive back from river, then use public transport, going north
• Contradict, using a mild expletive
• Deny having uprooted an underground stem
• An awkward brute to disprove
• Refute undisciplined brute
• Tuber (anag.)
• Refute allegation that truffle was planted upside-down
• Deny the potato, for instance, is making a comeback
• Refute objection by engineers
• Design feature lacking a free counter
• Disprove match official beginning to unveil note
• Perplex politician with an empty store of money?
• About to get going, after start of crossword puzzle
• Potato put over counter