The most common and most likely answer to this crossword clue is the 8 letter word WAKENING
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Buddy explains!
The straight part
We know that "getting up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case getting up = wakening.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 WAKENING mean?
WAKENING verb- To wake or rouse from sleep.
- To awaken; to cease to sleep; to be awakened; to stir.
- The act of awaking, or ceasing to sleep.