Cryptic crossword clue
Ultimately, innings do-or-die, unfortunately, for opener 4,4

The most common and most likely answer to this crossword clue is the 4 plus 4 letter word SIDE DOOR

I've seen this crossword clue in The Sunday Telegraph
S
I
D
E
D
O
O
R

Buddy explains!

The straight part
We know that "opener" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case opener = side door.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

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