Insuring a customer for a piece of jewellery (8)

I believe the answer is:

covering

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'insuring' is the definition.
('cover' can be a synonym of 'insure')

'a customer for a piece of jewellery' is the wordplay.
'a customer for' becomes 'cove' (I am not sure about this - if you are sure you should believe this answer much more).
'a piece of jewellery' becomes 'ring' (type of jewellery item).
'cove'+'ring'='COVERING'

Can you help me to learn more?

(Other definitions for covering that I've seen before include "Protecting" , "shelter" , "Sleeve" , "acting as a reporter" , "making new version of record" .)

I've seen this clue in the Evening Standard.

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