What's on hand after midnight? Nothing (5)
I believe the answer is:
glove
'what's on hand' is the definition.
I can't judge whether this defines the answer.
'after midnight? nothing' is the wordplay.
'after' means one lot of letters go next to another.
'midnight?' becomes 'g' (the middle letter in 'night').
'nothing' becomes 'love' (love is zero in tennis).
'g' put next to 'love' is 'GLOVE'.
Can you help me to learn more?
(Other definitions for glove that I've seen before include "something a boxer uses" , "Hand in this is very closely associated" , "Proverbially good fitter" , "Hand cover" , "On-hand children's entertainer?" .)