Crossword Genius

Write – "John Hancock” (4)


I believe the answer is:


I'm a little stuck... Click here to teach me more about this clue!

'write' is the definition.
(I know that sign is a more specific form of the action the write)

'john hancock' is the wordplay.
I cannot quite see how this works, but
'john hancock' could be 'sig' (I've seen this in another clue) and 'sig' is found within the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for sign that I've seen before include "Public notice; Leo, say" , "information board?" , "house" , "Public notice; portent" , "Ram" .)

I've seen this clue in the Evening Standard.
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