Possible Clues:

• Arm major (anag.)
• Republican invested in key American plant
• Food seasoning, also called oregano
• After damage, preserve sandwiches or seasoning
• Kind of herb
• Leading article male's written about right herb for cooking
• Herb related to oregano
• Herb and Josephine consumed by grass
• Aromatic mint relative
• Josephine divided a couple of battering types, making one slip back to sweet one in the garden