Furnish a First Fleet ship? (6)
I believe the answer is:
supply
This could be a double definition.
'furnish' is the first definition.
(I know that furnish can be written as supply)
'a first fleet ship?' is the second definition.
'supply' can be an answer for 'ship?' (supply ship is a kind of ship). I'm not sure about the 'a first fleet' bit.
Can you help me to learn more?
(Other definitions for supply that I've seen before include "Stand-in teacher" , "with considerable flexibility" , "in flexible way" , "Provide; flexibly" , "Contribute" .)