About to tuck into meal, ignoring starter he'd ruined (9)

'ruined' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how one could define the other.

'about to tuck into meal ignoring starter he'd' is the wordplay.
'about' becomes 'c' (circa).
'to tuck into' means one lot of letters goes inside another.
'meal' becomes 'supper' (supper is a kind of meal).
'ignoring starter' means to remove the first letter.
'c' placed within 'supper' is 'scupper'.
'hed' with its first letter removed is 'ed'.
'scupper'+'ed'='SCUPPERED'

Can you help me to learn more?