Pick fish up with the current (7)
I believe the answer is:
leeward
'current' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?
'pick fish up' is the wordplay.
'pick' becomes 'draw' (I can't explain this - if you can you should give a lot more credence to this answer).
'fish' becomes 'eel' (eel is a type of fish).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'draw'+'eel'='draweel'
'draweel' back-to-front is 'LEEWARD'.
'with the' is the link.
Can you help me to learn more?
(Other definitions for leeward that I've seen before include "to one side of boat" , "Drew ale (anag.)" , "place out of the wind" , "Islands" , "Quarter towards which the wind blows" .)