Panel gives old man nothing (4)
I believe the answer is:
dado
'panel' is the definition.
(dado is a kind of panel)
'old man nothing' is the wordplay.
'old man' becomes 'dad' (synonyms).
'nothing' becomes 'o' (looks like zero - 0).
'dad'+'o'='DADO'
'gives' is the link.
(Other definitions for dado that I've seen before include "Lower section of wall in room" , "part of wall specially decorated" , "Wood border running round room walls" , "low part of wall" , "Differently decorated lower part of an inside wall" .)