Three piggies, one lacking energy for confrontation (3-2-3)

'confrontation' is the definition.

'three piggies one lacking energy' is the wordplay.
'three piggies' means three substitutions for 'piggy'.
'piggy' becomes 'toe' (I've seen this before).
'piggy' becomes 'toe' (I've seen this before).
'piggy' becomes 'toe' (I've seen this before).
'one lacking' is a deletion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'toe'+'toe'='toetoe'
'toetoe' with 'e' taken out is 'totoe'.
'toe'+'totoe'='TOE-TO-TOE'

'for' acts as a link.