And French in bestowers of percussion instruments (10)

I believe the answer is:

detonators

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'percussion instruments' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'and french in bestowers' is the wordplay.
'and french' becomes 'et' ('and' in the French language).
'in' indicates putting letters inside.
'bestowers' becomes 'donators' (I can't explain this - if you can you should believe this answer much more).
'et' going into 'donators' is 'DETONATORS'.

'of' is the link.

Can you help me to learn more?

(Another definition for detonators that I've seen is " Test on road (anag.)".)

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

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