In being penniless, one has nothing (3)
I believe the answer is:
nil
'one has nothing' is the definition.
'nil' can be an answer for 'nothing' (eg nil is zero in football). I am unsure of the 'one has' bit.
'in being penniless' is the wordplay.
'in' indicates a hidden word.
'NIL' is hidden in the letters of 'being penniless'.
Can you help me to learn more?
(Other definitions for nil that I've seen before include "Nothing, naught" , "duck" , "Nothing, zilch" , "Latin zero" , "Non-existent" .)