Secure lad freely admitted to having acne scars (9)

'having acne scars' is the definition.
I can't tell whether this defines the answer.

'secure lad freely admitted' is the wordplay.
'secure' becomes 'pocked' (I can't explain this - if you can you should believe this answer much more).
'freely' indicates anagramming the letters.
'admitted' is an insertion indicator (inserted letters are admitted in).
'lad' with letters rearranged gives 'adl'.
'pocked' enclosing 'adl' is 'PADLOCKED'.

'to' acts as a link.

Can you help me to learn more?