Joy in middle of night having hauled up fish (4)
I believe the answer is:
glee
'joy' is the definition.
(I know that joy can be written as glee)
'middle of night having hauled up fish' is the wordplay.
'middle of night' becomes 'G' (middle letter of 'night').
'having' means one lot of letters go next to another.
'hauled up' is a reversal indicator.
'fish' becomes 'eel' (eel is a type of fish).
'eel' written backwards gives 'lee'.
'g'+'lee'='GLEE'
'in' is the link.
(Other definitions for glee that I've seen before include "Happiness" , "Great pleasure" , "Joy; part-song" , "Unholy mirth or triumphant joy" , "(Malicious) satisfaction" .)