Describing wave damage touching Icelandic coasts (8)

I believe the answer is:

harmonic

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'describing wave' is the definition.
The definition suggests a singular noun which matches the answer.

'damage touching icelandic coasts' is the wordplay.
'damage' becomes 'harm' (synonyms).
'touching' becomes 'on'.
'icelandic coasts' becomes 'ic' (this might be a standard abbreviation of which I'm unaware).
'harm'+'on'+'ic'='HARMONIC'

Can you help me to learn more?

(Other definitions for harmonic that I've seen before include "Relating to pleasing note combinations" , "Musical" , "Note produced as an overtone" , "Related note - type of progression" , "Tone" .)

I've seen this clue in The Guardian.

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