Give the girl weapons on joining the fleet (6)
I believe the answer is:
armada
'the fleet' is the definition.
(armada is a kind of fleet)
'give the girl weapons on joining' is the wordplay.
I cannot quite understand how this works, but
'girl' could be 'ada' and 'ada' is found within the answer.
The remaining letters 'arm' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for armada that I've seen before include "Naval fighting force" , "Large number of ships (Spanish?)" , "lot of craft" , "Old Spanish fleet" , "force of the sea" .)