Near Land's End? Shut up! (6)

I believe the answer is:

closed

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'shut up' is the definition.
(I've seen this before)

'near land's end?' is the wordplay.
'near' becomes 'close' (synonyms).
'land's end?' becomes 'd' (I can't explain this - if you can you should believe this answer much more).
'close'+'d'='CLOSED'

Can you help me to learn more?

(Other definitions for closed that I've seen before include "Held in private" , "Terminated" , "restricted" , "Concluded or fastened" , "See 1" .)

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