Fleet of ships (6)
'fleet of ships' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for armada that I've seen before include "lot of craft" , "Large Spanish fleet" , "A great fleet, ships or planes" , "Fleet of armed ships" , "group of ships" .)
(Other definitions for flotilla that I've seen before include "Fleet of small craft" , "number of boats" , "many boats" , "Small group of ships" , "A lot of craft" .)