Cryptic crossword clue
Concert is to be attended by the Queen — I give guarantee 8

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

I've seen this crossword clue in The Daily Telegraph
P
R
O
M
I
S
E
R

Buddy explains!

The straight part
We know that "I give guarantee" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i give guarantee = promiser.
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.

Crossword Answer definitions

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