Ironic, fans making inaudible sound (10)

I believe the answer is:

infrasonic

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'inaudible sound' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'ironic fans making' is the wordplay.
'making' is an anagram indicator.
'ironic'+'fans'='ironicfans'
'ironicfans' anagrammed gives 'INFRASONIC'.

Can you help me to learn more?

(Other definitions for infrasonic that I've seen before include "inaudible" , "too low to be noticed" .)

I've seen this clue in The Hindu.

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