Element causing trouble during abbreviated service (5)

I believe the answer is:

radon

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'element' is the definition.
(chemical element)

'trouble during abbreviated service' is the wordplay.
'trouble' becomes 'ado' (both can mean bother or commotion).
'during' means one lot of letters goes inside another.
'abbreviated service' becomes 'rn' (abbreviation for Royal Navy. I am not sure about the 'abbreviated' bit.).
'ado' put inside 'rn' is 'RADON'.

'causing' is the link.

Can you help me to learn more?

(Other definitions for radon that I've seen before include "A radioactive gas, symbol Rn" , "Element, symbol Rn" , "Naturally occurring inert gas" , "hazardous substance" , "Inert gas - adorn (anag)" .)

I've seen this clue in The Telegraph.

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