Cryptic crossword clue
Modernising, cheerful, sort of agency 8

The most common and most likely answer to this crossword clue is the 8 letter word UPDATING

I've seen this crossword clue in The Times
U
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Buddy explains!

The straight part
We know that "Modernising" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case modernising = updating.
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 UPDATING mean?

UPDATING verb
  1. To bring (a thing) up to date.
  2. To bring (a person) up to date: to inform (a person) about recent developments.
UPDATING noun
  1. The act by which something is updated.

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