Cryptic crossword clue
Addition exercise starts with four and five — nine! 5

The most common and most likely answer to this crossword clue is the 5 letter word AFFIX

A
F
F
I
X

Buddy explains!

The straight part
We know that "Addition" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case addition = affix.
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 AFFIX mean?

AFFIX noun
  1. That which is affixed; an appendage.
  2. A bound morpheme added to the word’s stem's end.
  3. (broadly) A bound morpheme added to a word’s stem; a prefix, suffix etc.
  4. The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b).
  5. (decorative art) Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature.
AFFIX verb
  1. To attach.
  2. To subjoin, annex, or add at the close or end; to append to.
  3. To fix or fasten figuratively; with on or upon.

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