Crossword Genius

Finally, seeing a narrow opening illuminated (6)

Ross

I believe the answer is:

gaslit

'illuminated' is the definition.
(thesaurus)

'finally seeing a narrow opening' is the wordplay.
'finally' suggests the final letters.
'narrow opening' becomes 'slit' (I've seen this before).
The final letter of 'seeing' is 'g'.
'g'+'a'+'slit'='GASLIT'

(Another definition for gaslit that I've seen is " Illuminated by pre-electric technology".)

I've seen this clue in The Times.
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