The most common and most likely answer to this crossword clue is the 7 letter word CLAPPER
I've seen this crossword clue in The Guardian
C
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More clues leading to the result CLAPPER
- One applauding head of personnel opening mangled parcel
- One gives hand in bringing them together
- Celtic language with origins of early regional tongue
- One showing appreciation of tongue
- Appreciative watcher gives tongue
- One applauds the bell-ringer
- Show appreciation for each part of bell
- Cold drink for each enthusiastic member of the audience
- One who applauds / striker
- Enthusiast signals shooting
Buddy explains!

The straight part
We know that "One showing appreciation/tongue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one showing appreciation/tongue = clapper.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 CLAPPER mean?
CLAPPER noun- One who claps; a person who applauds by clapping the hands.
- An object so suspended inside a bell that it may hit the bell and cause it to ring; a clanger or tongue.
- A wooden mechanical device used as a scarecrow; bird-scaring rattle, a wind-rattle or a wind-clapper.
- A clapstick (musical instrument).
- A pounding block.
- The chattering damsel of a mill.
- A slapshot
- The hinged part of a clapperboard, used to synchronise images and soundtrack, or the clapperboard itself.
- A person's tongue, as a source of chatter or nagging.
- To ring a bell by pulling a rope attached to the clapper.
- To make a repetitive clapping sound; to clatter.
- Of birds, to repeatedly strike the mandibles together.
- A rabbit burrow.