The most common and most likely answer to this crossword clue is the 4 plus 5 letter word BABY GRAND
B
A
B
Y
G
R
A
N
D
More clues leading to the result BABY GRAND
- Where set of keys may be found by relative opening grave
- In evil times, old woman’s instrument
- Piano group covering Deck of Cards singer, mostly
- New arrival with £1,000 for instrument
- Little Joanna‘s book advanced £1,000, given Times plug
- New arrival anticipating fine instrument
- The instrument Gabby plays for money
- New arrival supplied with £1000 for instrument
- In unhappy times relative will bring out piano
- Group in which Gary Barlow’s first played piano
Buddy explains!

The straight part
We know that "The instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the instrument = baby grand.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.