Crossword Genius

Small outbuilding is close (4)

Ross

I believe the answer is:

shut

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

'small outbuilding' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'outbuilding' becomes 'hut' (I am not sure about this - if you are sure you should believe this answer much more).
's'+'hut'='SHUT'

Can you help me to learn more?

(Other definitions for shut that I've seen before include "Push to" , "Draw to" , "See 19" , "Closed" , "Close" .)

I've seen this clue in The Sun.
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