The most common and most likely answer to this crossword clue is the 6 letter word VENOUS
I've seen this crossword clue in The Times
V
E
N
O
U
S
More clues leading to the result VENOUS
- Nothing blocking vision through certain tubes
- Goddess, we're told, is like a carrier of blood
- Beauty squeezing nothing from a vessel
- Some derive no use from a vessel
- Lovely broadcast about certain vessels?
- Pertinent to vessels is shape of orbit when captured by planet
- US oven switches concerning vessels
- Pertaining to the blood vessels of a Roman goddess, we hear
- Oxygenated 3 in de-oxygenated channels?
Buddy explains!

The straight part
We know that "through certain tubes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case through certain tubes = venous.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 VENOUS mean?
VENOUS adjective- Of or pertaining to veins.
- Possessing veins.
- Having numerous veins.