Possible Clues:

• Doubtful, pawnbroker, over a radiogram at first
• An ulcer (anag)
• Maybe Sam has a recipe that's ambiguous
• Relative area reduced by half? Not sure
• Not easy to see or hear
• Relation gets a final letter that's cryptic
• Doubtful pawnbroker, right to ring American
• Needing explaining
• Relative by a river, hazy
• Not easy to make out relative by a river