Came to an end, holed, leaking fluorine (9)

'came to an end holed leaking fluorine' is the definition.
I can't judge whether this defines the answer.

'came to an end holed' is the wordplay.
'came' becomes 'orate' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'an' becomes 'per' (synonymous as in 'once an hour', 'once per hour').
'end' suggests the final letters.
The last letter of 'holed' is 'd'.
'orate' put after 'per' is 'perorate'.
'perorate'+'d'='PERORATED'

Can you help me to learn more?