Grace Lamb upset by a quick message (9)

I believe the answer is:

cablegram

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'a quick message' is the definition.
'cablegram' can be an answer for 'message' (cablegram is a kind of message). I am not sure about the 'a quick' bit.

'grace lamb upset' is the wordplay.
'upset' is an anagram indicator.
'grace'+'lamb'='gracelamb'
'gracelamb' anagrammed gives 'CABLEGRAM'.

'by' is the link.

Can you help me to learn more?

(Another definition for cablegram that I've seen is " Urgent message".)

I've seen this clue in The Irish News.

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