Press charges at first - boy's very well defended? (4-4)
I believe the answer is:
iron-clad
'very well defended?' is the definition.
I know nothing about this answer so I can't tell whether this works.
'press charges at first boy's' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'at first' suggests taking the first letters.
'boy' becomes 'lad' (informal term for boy).
The initial letter of 'charges' is 'c'.
'iron'+'c'+'lad'='IRON-CLAD'
Can you help me to learn more?
(Another definition for iron-clad that I've seen is " in plate?".)