### Clue: Jack's lean (he left a fat-free order) (4)
### Answer: HEEL 
 ### Explanation: Definition: Jack's lean
 **Anagram of**(… order) ["he left a " **minus**(…-free) "fat "].
Defn: A nautical term, as Jack the seaman would use, relating to a vessel, meaning to lean over;to tilt.