Cryptic crossword clue
ETA presses ten Fairy Fellows into explosive testing 15

The most common and most likely answer to this crossword clue is the 15 letter word EXPERIMENTATION

I've seen this crossword clue in Independent
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Buddy explains!

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

EXPERIMENTATION noun
  1. The act of experimenting; practice by experiment.
  2. A set of actions and observations, performed to verify or falsify a hypothesis or to research a causal relationship between phenomena.

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