The most common and most likely answer to this crossword clue is the 9 letter word TRICKLING
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More clues leading to the result TRICKLING
Buddy explains!

The straight part
We know that "coming out slowly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coming out slowly = trickling.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 TRICKLING mean?
TRICKLING verb- To pour a liquid in a very thin stream, or so that drops fall continuously.
- To flow in a very thin stream or drop continuously.
- To move or roll slowly.
- The act or result of something that trickles.