Crossword Genius

Opening credit balance, finally, on immorality (7)

Ross

I believe the answer is:

crevice

'opening' is the definition.
(crevice is a kind of opening)

'credit balance finally on immorality' is the wordplay.
'credit' becomes 'cr'.
'finally' indicates one should take the final letters.
'on' means one lot of letters go next to another.
'immorality' becomes 'vice' (vice is a kind of immorality).
The final letter of 'balance' is 'e'.
'cr'+'e'+'vice'='CREVICE'

(Other definitions for crevice that I've seen before include "Opening" , "Cleft, fissure" , "Split" , "Narrow rock fissure" , "Narrow crack" .)

I've seen this clue in The Telegraph.
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