Nothing less about nothing? It's inauspicious (7)
I believe the answer is:
ominous
'it's inauspicious' is the definition.
(synonyms)
'nothing less about nothing?' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'less' becomes 'minus' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'nothing?' becomes 'o' (O resembles 0).
'minus' enclosing 'o' is 'minous'.
'o'+'minous'='OMINOUS'
(Other definitions for ominous that I've seen before include "Threatening, looks bad" , "Looking like trouble coming" , "'Threatening, foreshadowing tragedy (7)'" , "Looking like trouble ahead" , "Portentous" .)