It's stupid to be crafty about just one pound (5)

I believe the answer is:

silly

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'it's stupid' is the definition.
(I've seen this before)

'crafty about just one pound' is the wordplay.
'crafty' becomes 'sly' (sly can mean crafty or cunning).
'about' indicates putting letters inside.
'just one' becomes 'i' (Roman numeral. I am not sure about the 'just' bit.).
'pound' becomes 'L' (the pound sign is based on an L).
'i'+'l'='il'
'sly' enclosing 'il' is 'SILLY'.

'to be' acts as a link.

Can you help me to learn more?

(Other definitions for silly that I've seen before include "near the batsman" , "Idiotic" , "Daft" , "Stupid" , "Goose" .)

I've seen this clue in the Evening Standard.

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