The most common and most likely answer to this crossword clue is the 8 letter word YOUNGEST
I've seen this crossword clue in The Sunday Telegraph
Y
O
U
N
G
E
S
T
More clues leading to the result YOUNGEST
- The solver gets sent out with note, being most junior
- Most junior guy on set, surprisingly
- Most junior American greeting a French visitor leaving university
- Unknown tongues translated for baby
- Second person with no starter to eat? Most immature
- Guy’s note misdirected, delivered most recently
- Most recently arrived surprisingly gutsy one
- Most junior solver finding gents busy
Buddy explains!

The straight part
We know that "delivered most recently" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case delivered most recently = youngest.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 YOUNGEST mean?
YOUNGEST adjective- In the early part of growth or life; born not long ago.
- At an early stage of existence or development; having recently come into existence.
- (Not) advanced in age; (far towards or) at a specified stage of existence or age.
- Junior (of two related people with the same name).
- (of a decade of life) Early.
- Youthful; having the look or qualities of a young person.
- Of or belonging to the early part of life.
- Having little experience; inexperienced; unpracticed; ignorant; weak.
- The youngest child in a family, or individual in a group.