Cryptic crossword clue
Energy invested in design of a logo, shape of a tube 11

The most common and most likely answer to this crossword clue is the 11 letter word OESOPHAGEAL

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "of a tube" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of a tube = oesophageal.
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 OESOPHAGEAL mean?

OESOPHAGEAL adjective
  1. Of or pertaining to the esophagus.

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