Boxing in Jack and King with lead of ten (5,3)

'boxing' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?

'in jack and king with lead of ten' is the wordplay.
'in jack' becomes 'nob' (term in the card game cribbage. I am not sure about the 'in' bit.).
'and' says to put letters next to each other.
'king' becomes 'lear' (King Lear).
'with' is a charade indicator (letters next to each other).
'lead of' suggests taking the first letters (I've seen 'leading' mean this).
The initial letter of 'ten' is 't'.
'nob'+'lear'+'t'='NOBLE ART'

Can you help me to learn more?