### Clue: Applicant's hostile answer struck out in court (6)
### Answer: CLIENT 
 ### Explanation: Definition: Applicant
 "alien"(hostile;opposed to) **minus**(… struck out) "a"(abbrev. for "answer) **contained in**(in) CT(abbrev. for "court", a short street).
Defn: One who applies for, or requests, say, advice from a professional person.