Cryptic crossword clue
The lowest figure, fractionally, even if quite common 11

The most common and most likely answer to this crossword clue is the 11 letter word DENOMINATOR

I've seen this crossword clue in The Daily Telegraph
D
E
N
O
M
I
N
A
T
O
R

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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 DENOMINATOR mean?

DENOMINATOR noun
  1. The number or expression written below the line in a fraction (such as 2 in ½).
  2. One who gives a name to something.

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