Like some iron, approximate in weight (7)

I believe the answer is:

wrought

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'like some iron' is the definition.
'wrought' can be an answer for 'iron' (wrought iron is a kind of iron). I'm not sure about the 'like some' bit.

'approximate in weight' is the wordplay.
'approximate' becomes 'rough' (I've seen this in another clue).
'in' indicates putting letters inside.
'weight' becomes 'wt'.
'rough' going inside 'wt' is 'WROUGHT'.

Can you help me to learn more?

(Other definitions for wrought that I've seen before include "Worked by hammering or beating" , "Made" , "knocked into shape" , "Ornamented" , "Shaped by hammering" .)

I've seen this clue in The Guardian.

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