"PRUSSIC" IS THE Answer TO THE FOLLOWING CROSSWORDS

1. The spur is broken like this, so it may be a cid matter
2. If it's a cid matter it may be a murder matter
3. The spur has got twisted like this
4. Broken spurs, i see, will prove fatal with 31 across
5. The sort of cyanide for a cid at last if it's like this at last
6. Sort of acid acceptable around most of vast country
7. Killer from portugal caught arrested by state police

OTHER CLUES

1. Annual coll. basketball c
2. Actors like empty citadel, not one in spanish region
3. Belvedere park locale, wi
4. Army dog?
5. Boho-chic footwear
6. What a double shot of caffeine provides
7. A girl who likes explorations into kinky love
8. Basic food keeps a lecturer going back for tasty cake?