Cryptic crossword clue
Talks excitedly? Employs profanity, for a start 7

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

I've seen this crossword clue in The Guardian
E
F
F
U
S
E
S

Buddy explains!

The straight part
We know that "Talks excitedly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case talks excitedly = effuses.
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 EFFUSES mean?

EFFUSES verb
  1. To emit; to give off
  2. To gush; to be excitedly talkative and enthusiastic about something
  3. To pour out like a stream or freely; to cause to exude; to shed.
  4. To leak out through a small hole

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