The most common and most likely answer to this crossword clue is the 5 letter word EKING
E
K
I
N
G
More clues leading to the result EKING
- Managing to be master of the internet?
- Supplementing on-line 3D?
- With difficulty, making Earl sovereign
- …out of electronic ruler, making it longer
- Struggling to get virtual monarch?~
- English sovereign is living frugally
- English ruler struggling to make supplies last
- Making out and squealing after the top comes off?
- Perhaps Ben is making something last longer?
Buddy explains!

The straight part
We know that "Supplementing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supplementing = eking.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 EKING mean?
EKING noun- The act or process of adding.
- That which is added.
- A supplementary piece of timber used to lengthen another.
- Chiefly in the form eke out: to add to, to augment; to increase; to lengthen.