Crossword Genius

Observed screen did go haywire (9)

Ross

I believe the answer is:

discerned

'observed' is the definition.
(discern can mean to observe or notice)

'screen did go haywire' is the wordplay.
'go haywire' is an anagram indicator.
'screen'+'did'='screendid'
'screendid' is an anagram of 'DISCERNED'.

(Other definitions for discerned that I've seen before include "Distinguished, made out" , "Caught sight of" , "Identified by close investigation" .)

I've seen this clue in The Guardian.
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