The most common and most likely answer to this crossword clue is the 7 letter word POKIEST
I've seen this crossword clue in The Times
P
O
K
I
E
S
T
More clues leading to the result POKIEST
Buddy explains!
The straight part
We know that "Smallest and narrowest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case smallest and narrowest = pokiest.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 POKIEST mean?
POKIEST adjective- Slow.
- Stupid; mentally dull.
- (of a room or other enclosed space) Small and cramped, and often shabby.