Cryptic crossword clue
One might say the conversation was humming 7

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

I've seen this crossword clue in Financial Times
W
H
I
R
R
E
D

Buddy explains!

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 WHIRRED mean?

WHIRRED verb
  1. To move or vibrate (something) with a buzzing sound.
  2. To make a sibilant buzzing or droning sound.
  3. To cause (something) to make such a sound.

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