Good, fly off, silly old bugger! (3,4)

I believe the answer is:

old fogy

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'silly old bugger' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'good fly off' is the wordplay.
'off' is an anagram indicator.
'good'+'fly'='goodfly'
'goodfly' is an anagram of 'OLD-FOGY'.

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(Other definitions for old fogy that I've seen before include "Codger" , "Elderly person who resists change" .)

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

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