Cryptic crossword clue
ASEAN capitals developed very slowly 2,1,6,4

The most common and most likely answer to this crossword clue is the 2 plus 1 plus 6 plus 4 letter word AT A SNAILS PACE

I've seen this crossword clue in The Times
A
T
A
S
N
A
I
L
S
P
A
C
E

Buddy explains!

The straight part
We know that "very slowly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very slowly = at a snails pace.
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.

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