Cryptic crossword clue
Desire full bust? – here’s Iris 5-2-3

The most common and most likely answer to this crossword clue is the 12 letter word FLEUR-DE-LIS

I've seen this crossword clue in Financial Times
F
L
E
U
R
-
D
E
-
L
I
S


Buddy explains!

The straight part
We know that "Iris" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case iris = fleur-de-lis.
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 FLEUR-DE-LIS mean?

FLEUR-DE-LIS noun
  1. A design representing a flower whose three petals are joined together at the bottom, often used in heraldry, where it is particularly associated with the French monarchy.

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