Bounder in intelligence group a noisy insect? (6)

I believe the answer is:

cicada

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'a noisy insect?' is the definition.
(I've seen this before)

'bounder in intelligence' is the wordplay.
'bounder' becomes 'cad' (synonyms).
'in' indicates putting letters inside.
'intelligence' becomes 'CIA' (Central Intelligence Agency).
'cad' put into 'cia' is 'CICADA'.

'group' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for cicada that I've seen before include "jumpy creature" , "six-footer?" , "Insect with a high- pitched drone" , "Chirpy type" , "crawler" .)

I've seen this clue in the Sydney Morning Herald.

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