Crossword Genius

Assumed name I overlooked, regrettably (4)

Ross

I believe the answer is:

alas

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

'assumed name i overlooked' is the wordplay.
'assumed name' becomes 'alias' (synonyms).
'overlooked' is a deletion indicator.
'alias' with 'i' taken out is 'ALAS'.

(Other definitions for alas that I've seen before include "Sadly, unfortunately" , "Exclamation of misfortune" , "express regret thus" , "Oh dear!" , "Proper, respectable" .)

I've seen this clue in The Telegraph.
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