Crossword Genius

Radical junior in charge too high to catch? (10)

Ross

I believe the answer is:

ultrasonic

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'too high to catch?' is the definition.
I can't tell whether this defines the answer.

'radical junior in charge' is the wordplay.
'radical' becomes 'ultra' (synonyms).
'junior' becomes 'son'.
'in charge' becomes 'ic' (abbreviation for 'in charge').
'ultra'+'son'+'ic'='ULTRASONIC'

Can you help me to learn more?

(Other definitions for ultrasonic that I've seen before include "Higher than can be heard" , "Involving sound waves beyond human hearing" , "Above the limit of human hearing" , "Of high frequency" .)

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