The most common and most likely answer to this crossword clue is the 8 letter word RE-ENTER
I've seen this crossword clue in The Guardian
R
E
-
E
N
T
E
R
More clues leading to the result RE-ENTER
- One who’s sore maybe after kicking small log over
- Once again insert some green terminology
- Tenant accepting lease finally to regain admittance
- Tenant clutching bottle’s last to come in again
- Atoner to bid farewell to parish leader and go through the door, not for the first time
- About to record again, as a space traveller must...
- Drug smuggled by tenant? Come again!
Buddy explains!
The straight part
We know that "regain admittance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case regain admittance = re-enter.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.
What does RE-ENTER mean?
RE-ENTER verb- To enter again; return into.
- To enter again; retype, reinput.
- (engraving) To cut deeper where the aqua fortis has not bitten sufficiently.