Cryptic crossword clue
Raises squad to cross river nearer its source 8

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

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "nearer its source" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nearer its source = upstream.
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 UPSTREAM mean?

UPSTREAM noun
  1. Part of the river towards the upstream direction.
  2. (open-source software) The original developers or maintainers of software.
UPSTREAM verb
  1. To stream upward.
  2. (open-source software) To have (a software library, patch, etc.) accepted by the original developers of the related software, so that they maintain and distribute it.
UPSTREAM adjective
  1. In a direction against the flow of a current or stream of fluid (typically water); upriver
  2. Involving exploration and pre-production rather than refining and selling
  3. In the direction from the client to the server
  4. (open-source software) maintained, owned or associated with the original developers of the given software; in contrast to a modified version downstream
  5. Towards the leading end (5′ end) of a DNA molecule
UPSTREAM adverb
  1. Against the current.

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