Single item editor agreed (6)

I believe the answer is:

united

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

'single item editor' is the wordplay.
'single item' becomes 'unit' (I've seen this before).
'editor' becomes 'ed'.
'unit'+'ed'='UNITED'

(Other definitions for united that I've seen before include "Untied (anag.)" , "Of like mind" , "Untied, being allied" , "Allied or combined" , "See 18" .)

I've seen this clue in The Telegraph.

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