Plan is stupid containing little right (5)

I believe the answer is:

draft

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'plan' is the definition.
(drafting is a kind of planning)

'stupid containing little right' is the wordplay.
'stupid' becomes 'daft' (I've seen this before).
'containing' indicates putting letters inside.
'little right' becomes 'r' (common abbreviation. I am not sure about the 'little' bit.).
'daft' enclosing 'r' is 'DRAFT'.

'is' is the link.

Can you help me to learn more?

(Other definitions for draft that I've seen before include "Send" , "Preliminary drawing" , "Current of air or preliminary sketch" , "sketch, perhaps" , "Provisional document" .)

I've seen this clue in The Times.

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