The most common and most likely answer to this crossword clue is the 7 letter word STATELY
I've seen this crossword clue in The Guardian
S
T
A
T
E
L
Y
More clues leading to the result STATELY
- Royal phone held by supporter
- Figure cathedral is majestic
- August report largely devoid of content
- Showing great dignity art gallery cut cunning
- Arch around gallery is very impressive
- Imposing vacuous lunacy on country
- Very impressive visit without telephone
- Now see gallery in artful style at work that’s grand
- . Sneaky about gallery that is dignified
- Say case of lady becoming noble
Buddy explains!

The straight part
We know that "grand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grand = stately.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 STATELY mean?
STATELY adjective- Of people: worthy of respect; dignified, regal.
- Of movement: deliberate, unhurried; dignified.
- Grand, impressive, imposing.
- In a stately manner.