### Clue: Boatman changing direction for chemist's last place on the 24 (6)
### Answer: TAILOR 
 ### Explanation: Definition: place on the 24
 "sailor"(a boatman;a man working on a boat) **with its** "s"(abbrev. for "south", a direction) **replaced by**(changing … for) **last letter of**(…'s last) "chemist".