Related Clues:

• Second (not leader), second-rate
• Second, not top, so uncertain
• 'Wary', as a Shakespearean king said
• Unreliable as a US pickup truck maker?
• Instant — not opening but open to doubt
• Doubt - man held by police
• Questionable - uncertain
• Doubt - man being questioned by police
• One thought to be guilty
• Possible criminal - doubtful
• Dodgy
• Not confident
• Cautious due to suspicions
• Unreliable
• Suspicious (as trout?)