Son, breaking pieces, taps good egg (6)
I believe the answer is:
mensch
'good egg' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'son breaking pieces taps' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'breaking' means one lot of letters goes inside another.
'pieces' becomes 'men' (man can mean a chess piece).
'taps' becomes 'ch' (cold and hot taps).
'men'+'ch'='mench'
's' placed into 'mench' is 'MENSCH'.
Can you help me to learn more?
(Other definitions for mensch that I've seen before include "Decent guy" , "Decent chap" , "Brick, US-style" , "Decent person" .)