Cryptic crossword clue
Irrational being on French coin of yesteryear 4

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

S
U
R
D

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The straight part
We know that "Irrational" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case irrational = surd.
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 SURD mean?

SURD noun
  1. An irrational number, especially one expressed using the √ symbol.
  2. A voiceless consonant.
SURD adjective
  1. Lacking the sense of hearing; deaf.
  2. Unheard
  3. Involving surds, or irrational numbers; not capable of being expressed in rational numbers.
  4. Unvoiced; voiceless

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