Possible Clues:

• Support police crossing river for basic foodstuffs
• Carrots and radishes, e.g
• Spud's motherland covers most of 23 down
• Spud's Trim photographs found in motherland
• Beets and turnips, for two (2 words)
• Troops (or leading company) deployed in trenches
• Such as beets, turnips, etc
• Carrots and beets, e.g.