The spelling of the word "claunch" can be explained using the IPA phonetic transcription. The first sound is "kl" which is a voiceless velar plosive followed by "ɔː" which is an open-mid back rounded vowel. The "n" is pronounced as a voiced alveolar nasal and the "tʃ" is a voiceless palatal affricate. Lastly, the "ʃ" is a voiceless postalveolar fricative. Thus, the correct spelled word "claunch" has the pronunciation klaw-nch.
The word "claunch" has originated from the Middle English term "clench", which means to grasp or grip tightly. This word is ultimately derived from the Old English word "clencan", which has a similar meaning. Over time, "clench" has transformed into "claunch" through dialectal variation. "Claunch" is primarily used in Scottish and Northern English dialects, where it retains its original sense of tightly gripping something.