Cryptic crossword clue
Their angle can be adjusted to be identical, possibly 15

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

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

The straight part
We know that "identical, possibly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case identical, possibly = interchangeable.
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 INTERCHANGEABLE mean?

INTERCHANGEABLE noun
  1. Anything that can be interchanged; a substitute.
INTERCHANGEABLE adjective
  1. Freely substitutable; that may be swapped at will.
  2. Following each other in alternate succession; alternating.

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