Good family introduces leading man (4)
I believe the answer is:
king
'leading man' is the definition.
'king' can be an answer for 'man' (man can mean a chess piece). I am unsure of the 'leading' bit.
'good family introduces' is the wordplay.
'good' becomes 'g' (abbreviation).
'family' becomes 'kin' (synonyms).
'introduces' says to put letters next to each other (some letters come before or introduce others).
'g' after 'kin' is 'KING'.
Can you help me to learn more?
(Other definitions for king that I've seen before include "Male royal" , "Chess piece" , "indispensable on board" , "Playing-card" , "initially unable to move" .)