Send letter seeking debt forgiveness (8)

I believe the answer is:

writeoff

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'debt forgiveness' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'send letter' is the wordplay.
'send' becomes 'write' (synonyms).
'letter' becomes 'off' (I can't justify this - if you can you should give a lot more credence to this answer).
'write'+'off'='WRITEOFF'

'seeking' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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