### Clue: Watchful old marshal's into weed (4-4)
### Answer: OPEN-EYED 
 ### Explanation: Definition: Watchful
 O(abbrev. for "old") + [ NEY(Michel, aka Marshal Ney, French military commander during the French Revolutionary Wars and the Napoleonic Wars) **contained in**(…'s into) PEED(weed/past tense of "to pee") ].