Cryptic crossword clue
Speaker, incredibly, never had to open function 4

The most common and most likely answer to this crossword clue is the 4 letter word SINH

I've seen this crossword clue in Independent
S
I
N
H

Buddy explains!

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

SINH noun
  1. A traditional tube skirt worn by Lao and Thai women, particularly northern Thai and northeastern Thai women.

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