The most common and most likely answer to this crossword clue is the 7 plus 3 letter word HEARING AID
I've seen this crossword clue in The Daily Telegraph
H
E
A
R
I
N
G
A
I
D
More clues leading to the result HEARING AID
- Nigeria had ordered a sound investment
- Circuit with a current in front helps one pick up?
- Trial by one in promotion of audio device
- Hid gear in a broken amplifier
- Sound excellent in cranium — due to this?
- It makes sound sense to those in need
- Help required to follow trial?
- Gained hair untidily that’s on the side of the head
- Back goes after picking up an amplifier
- Sound equipment Nigeria had distributed
Buddy explains!

The straight part
We know that "Sound excellent in cranium — due to this?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sound excellent in cranium — due to this? = hearing aid.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.