Cryptic crossword clue
Athlete swallows one more fluid 7

The most common and most likely answer to this crossword clue is the 7 letter word RUNNIER

I've seen this crossword clue in The Guardian
R
U
N
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R

Buddy explains!

The straight part
We know that "more fluid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more fluid = runnier.
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 RUNNIER mean?

RUNNIER adjective
  1. Fluid; capable of flowing.
  2. Liable to run or drip.

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