### Clue: First-rate crack (3-5)
### Answer: TOP-NOTCH 
 ### Explanation: Definition: First-rate,crack
 I'm not sure how to parse this. It seems the setter intended this to be a double defn. clue, even though "first-rate", "crack" and "top-notch" are all synonymous to one another.  Is there another meaning common to only 2 of them?