Saw off light-fuse for hearing (10)

I believe the answer is:

farewelled

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'saw off' is the definition.
The definition suggests a past participle verb which matches the answer.

'light-fuse for hearing' is the wordplay.
'light' becomes 'fare' (I can't justify this - if you can you should believe this answer much more).
'fuse' becomes 'weld' (I've seen this before).
'for hearing' shows a homophone (sound like).
'weld' sounds like 'welled'.
'fare'+'welled'='FAREWELLED'

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I've seen this clue in the Sydney Morning Herald.

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