Go red in becoming overlooked (7)
I believe the answer is:
ignored
'overlooked' is the definition.
(I've seen this before)
'go red in becoming' is the wordplay.
'becoming' indicates an anagram.
'go'+'red'+'in'='goredin'
'goredin' anagrammed gives 'IGNORED'.
(Other definitions for ignored that I've seen before include "Failed to notice" , "Took no notice of" , "overlooked" , "Cut" , "cast aside" .)