Pull fish up to one side of the boat (7)
I believe the answer is:
leeward
'one side of the boat' is the definition.
I can't judge whether this defines the answer.
'pull fish up' is the wordplay.
'pull' becomes 'draw' (drawing is a kind of pulling).
'fish' becomes 'eel' (eel is a type of fish).
'up' is a reversal indicator (in down clue: letters go upwards).
'draw'+'eel'='draweel'
'draweel' reversed gives 'LEEWARD'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for leeward that I've seen before include "Towards the sheltered side" , "The way the wind blows" , "Of ship, on side turned away from wind" , "Heading for shelter" , "side of sailors" .)