Nothing satisfactory after hard punch (4)
I believe the answer is:
hook
'punch' is the definition.
(type of punch in boxing)
'nothing satisfactory after hard' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'satisfactory' becomes 'ok' (similar in meaning).
'after' says to put letters next to each other.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'o'+'ok'='ook'
'ook' after 'h' is 'HOOK'.
(Other definitions for hook that I've seen before include "stroke at Lord's?" , "Peter Pan captain" , "Attacking shot" , "Villainous captain" , "good catch" .)