### Clue: Pit bull terrier (stray one's gone) (5)
### Answer: OXTER 
 ### Explanation: Definition: Pit 
 OX(an adult castrated bull) + "terrier" **minus**(…'s gone) ["err"(to stray beyond what's right) + "I"(Roman numeral for "one") ]
Answer: Dialect for the "armpit".