Crossword Genius

English frown about smooth Brexit finally getting doubly hard in last possible moment (8,4)

Ross

I believe the answer is:

eleventh hour

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'possible moment' is the definition.
The definition suggests a singular noun which matches the answer.

'english frown about smooth brexit finally getting doubly hard in last' is the wordplay.
I cannot quite see how this works, but
'english' could be 'e' (abbreviation) and 'e' is located in the answer.
'smooth' could be 'even' (similar in meaning) and 'even' is found in the answer.
'hard' could be 'h' (abbreviation used in pencil classifications) and 'h' is found within the answer.
'last' could be 't' (I've seen this in other clues) and 't' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for eleventh hour that I've seen before include "well before noon" , "Latest possible moment" , "a sixty-minute period" , "Last-minute" , "Last minute" .)

I've seen this clue in The Hindu.
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