Crossword Genius

Without sun, I’m backsliding (5)

Ross

I believe the answer is:

minus

'without' is the definition.
(minus means without)

'sun i'm backsliding' is the wordplay.
'i'm' becomes 'im' ().
'backsliding' says the letters should be written backwards.
'sun'+'im'='sunim'
'sunim' in reverse letter order is 'MINUS'.

(Other definitions for minus that I've seen before include "Deprived of" , "'Take away' sign" , "Less, without" , "deficiency" , "Negative sign - negative thing" .)

I've seen this clue in The Mirror.
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