Related in edited form (7)

I believe the answer is:

altered

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'edited form' is the definition.
'altered' can be an answer for 'edited' (altering is a kind of editing). I'm not certain of the 'form' bit.

'related' is the wordplay.
'related' can be anagrammed to 'ALTERED'.
However, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for altered that I've seen before include "Metamorphosed" , "Reformed" , "Changed, modified" , "Treadle (anag)" , "Different" .)

I've seen this clue in the Evening Standard.

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