Responsible for placing uranium in shell (7)

I believe the answer is:

causing

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'responsible for' is the definition.
(I've seen this in another clue)

'uranium in shell' is the wordplay.
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'in' indicates putting letters inside.
'shell' becomes 'casing' (synonyms).
'u' going into 'casing' is 'CAUSING'.

'placing' is the link.
This may not be right. It may belong to another bit of the clue.

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(Other definitions for causing that I've seen before include "Precipitating" , "Giving rise to" , "Generating" .)

I've seen this clue in The Sun.

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