The most common and most likely answer to this crossword clue is the 7 letter word REFRESH
I've seen this crossword clue in Independent
R
E
F
R
E
S
H
More clues leading to the result REFRESH
- Update reference concerning small hotel
- Update reference, adding on not another word
- Update: Judge right? He’s wrong
- Judge considering quiet update
- Arbiter with regard to quiet update
- Update whistleblower before she runs off
- Invigorate upstanding woman keeping one in thrall
- Update information about novel
- Breathe new life into slave throttled by her on the way up
- Immersed in baths, ‘er ferrets fipping get like new again!
Buddy explains!

The straight part
We know that "Invigorate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case invigorate = refresh.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 REFRESH mean?
REFRESH noun- The periodic energizing required to maintain the contents of computer memory, the display luminance of a computer screen, etc.
- The update of a display (in a web browser or similar software) to show the latest version of the data.
- The process of modernizing something.
- To renew or revitalize.
- To become fresh again; to be revitalized.
- To reload (a document, especially a webpage) and show any new changes.
- To cause (a web browser or similar software) to refresh its display.
- To perform the periodic energizing required to maintain the contents of computer memory, the display luminance of a computer screen, etc.
- To take refreshment; to eat or drink.