### Clue: Tanks in army's front, as bearing westwards (7)
### Answer: AQUARIA 
 ### Explanation: Definition: Tanks
 **1st letter of**(…'s front) "army" + QUA(as/by virtue of being, as in "the prime minister qua head of his party led the debate" + **reversal of**(… westwards, in an across clue) AIR(bearing/demeanour that conveys some personal quality or emotion).**
Defn:  … for keeping live fish and other water creatures and plants.