Damage jewellery pocketing one gem criminally, triggering alarm (14)

I believe the answer is:

scaremongering

I'm a little stuck... Click here to teach me more about this clue!

'triggering alarm' is the definition.
(scaremongering may cause alarm or panic)

'damage jewellery pocketing one gem criminally' is the wordplay.
'damage jewellery' becomes 'scarring' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pocketing' is an insertion indicator (pocket can mean to steal or take possession of).
'criminally' indicates anagramming the letters (I've seen this in other clues).
'one'+'gem'='onegem'
'onegem' anagrammed gives 'emonge'.
'scarring' going around 'emonge' is 'SCAREMONGERING'.

Can you help me to learn more?

I've seen this clue in The Guardian.

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