Notice border pass with British letterheads is recommended (9)

I believe the answer is:

advisable

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'is recommended' is the definition.
(similar in meaning)

'notice border pass with british letterheads' is the wordplay.
I cannot quite see how this works, but
'notice' could be 'ad' (both can mean an advertisement) and 'ad' is located in the answer.
'pass' could be 'visa' (pass allowing international travel) and 'visa' is found within the answer.
'british' could be 'b' (abbreviation e.g. in 'BBC') and 'b' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for advisable that I've seen before include "Wise, recommended" , "Prudent - recommended" .)

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

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