Crossword Genius

Extend journalist Frank's doting sign-off? (5)

Ross

I believe the answer is:

annex

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'extend journalist' is the definition.
I can't tell whether this defines the answer.

'frank's doting sign-off?' is the wordplay.
'frank' becomes 'anne' (Anne Frank, Holocaust victim).
'doting sign off?' becomes 'x' (I can't explain this - if you can you should give a lot more credence to this answer).
'anne'+'x'='ANNEX'

Can you help me to learn more?

(Other definitions for annex that I've seen before include "Add to the end; take possession of" , "Add as an extra part" , "Tack on" , "Attach(ment)" , "Attach, invade" .)

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