The most common and most likely answer to this crossword clue is the 8 letter word SHORTEST
S
H
O
R
T
E
S
T
More clues leading to the result SHORTEST
Buddy explains!

The straight part
We know that "Tiniest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tiniest = shortest.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 SHORTEST mean?
SHORTEST adjective- Having a small distance from one end or edge to another, either horizontally or vertically.
- (of a person) Of comparatively small height.
- Having little duration.
- (followed by for) Of a word or phrase, constituting an abbreviation (for another) or shortened form (of another).
- (of a fielder or fielding position) that is relatively close to the batsman.
- (of a ball) that bounced relatively far from the batsman.
- (of an approach shot or putt) that falls short of the green or the hole.
- (of pastries) Brittle, crumbly, especially due to the use of a large quantity of fat. (See shortbread, shortcake, shortcrust, shortening.)
- Abrupt; brief; pointed; petulant.
- Limited in quantity; inadequate; insufficient; scanty.
- Insufficiently provided; inadequately supplied, especially with money; scantily furnished; lacking.
- Deficient; less; not coming up to a measure or standard.
- Undiluted; neat.
- Not distant in time; near at hand.
- Being in a financial investment position that is structured to be profitable if the price of the underlying security declines in the future.