The most common and most likely answer to this crossword clue is the 6 letter word UNTOLD
I've seen this crossword clue in The Sunday Telegraph
U
N
T
O
L
D
More clues leading to the result UNTOLD
- Without number one receding group died
- Former racing driver with support in East End? It’s extensive
- Had not revealed such wealth
- Many still awaiting relation?
- Very many not informed
- Not informed, as very many may be
- Such a story remains secret
- One out of force veteran too many
- Boundless, as story no one’s heard?
- Squadron, say, drops one veteran without number
Buddy explains!

The straight part
We know that "Many/still awaiting relation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case many/still awaiting relation = untold.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 UNTOLD mean?
UNTOLD adjective- Not told; not related; not revealed; secret.
- Not numbered or counted.
- Not able to be counted, measured, told, expressed in words, or described; extremely large in scale, number, quantity, suffering, damage, etc.; uncountable, unmeasurable, immeasurable, indescribable, inexpressible.