Whisper turbulence inside could make them anxious (7)

I believe the answer is:

perturb

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'make them anxious' is the definition.
I can't tell whether this definition defines the answer.

'whisper turbulence inside' is the wordplay.
'inside' says the answer is hidden in the clue.
'PERTURB' is hidden in the letters of 'whisper turbulence'.

'could' is the link.

Can you help me to learn more?

(Other definitions for perturb that I've seen before include "Bother" , "Discountenance" , "Ruffle the composure (of)" , "Unsettle; PR brute (anag.)" , "Unsettle, make anxious" .)

I've seen this clue in The Irish Times.

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