Cryptic crossword clue
Advantage is seized by partners on the side 8

The most common and most likely answer to this crossword clue is the 8 letter word EDGEWISE

I've seen this crossword clue in The Times
E
D
G
E
W
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S
E

Buddy explains!

The straight part
We know that "on the side" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on the side = edgewise.
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 EDGEWISE mean?

EDGEWISE adjective
  1. Edgeways.
EDGEWISE adverb
  1. Edgeways.
  2. As if by an edge.

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