Equip a girl with ships (6)
I believe the answer is:
armada
'ships' is the definition.
(group of ships)
'equip a girl' is the wordplay.
'equip' becomes 'arm' (arm can mean to equip someone with something).
'a girl' becomes 'ada' (girl's name).
'arm'+'ada'='ARMADA'
'with' acts as a link.
(Other definitions for armada that I've seen before include "Old Spanish fleet" , "Spanish fleet sent in 1588 to escort an invasion of England" , "1588 sea battle" , "Large number of ships (Spanish?)" , "Many ships" .)