Crossword Genius

Admiral's second vessel is obscure (4)

Ross

I believe the answer is:

dark

'is obscure' is the definition.
(similar in meaning)

'admiral's second vessel' is the wordplay.
'admiral's second' becomes 'd' (rnd letter of 'admiral').
'vessel' becomes 'ark' (ark is a kind of vessel).
'd'+'ark'='DARK'

(Other definitions for dark that I've seen before include "Black, perhaps - night" , "Absence of light" , "Saturnine" , "Gloomy" , "Closed as theatre" .)

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