Crossword Genius

With key one's certain to get an opening (7)

Ross

I believe the answer is:

fissure

Here is my best explanation:

'an opening' is the definition.

(fissure is a kind of opening)

'with key one's certain' is the subsidiary indication.

'with' is a charade indicator (letters next to each other).

'key' becomes 'f' (I've seen this in other clues).

'one's' becomes 'is' ('I' can be a synonym of 'one').

'certain' becomes 'sure' ('sure' can be a synonym of 'certain').

'f' put next to 'is' is 'fis'.

'fis'+'sure'='fissure'

'to get' is the link.

This clue was last seen in The Telegraph

(Other definitions for fissure that I've seen before include "Long, narrow opening", "Split, crack", "Split - cleavage", "Cleft", "Crack in rock", "Long, narrow crack" and "Crevice".)

Ross

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