Cryptic crossword clue
Outside broadcast, with beavers active around lake that can been seen

The most common and most likely answer to this crossword clue is the 10 letter word OBSERVABLE

I've seen this crossword clue in The Guardian
O
B
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Buddy explains!

The straight part
We know that "can been seen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can been seen = observable.
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 OBSERVABLE mean?

OBSERVABLE noun
  1. Any physical property that can be observed and measured directly and not derived from other properties
OBSERVABLE adjective
  1. Able to be observed.
  2. Deserving to be observed; worth regarding; remarkable.

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