### Clue: Soldier possibly joins wife before heading back for port (7)
### Answer: ANTWERP 
 ### Explanation: Definition: port
 ANT(a social insect, possibly a member of the soldier caste) **plus**(joins) W(abbrev. for "wife") + **reversal of**(…. heading back) PRE-(prefix signifying something earlier in time/before).
Defn: … in Belgium.