Calm disrupted by first person's big noise (7)

I believe the answer is:

clamour

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'big noise' is the definition.
(clamour can mean a loud noise)

'calm disrupted by first person's' is the wordplay.
'disrupted' indicates an anagram.
'by' means one lot of letters go next to another.
'first person' becomes 'our' (I am not sure about this - if you are sure you should believe this answer much more).
'calm' with letters rearranged gives 'clam'.
'clam'+'our'='CLAMOUR'

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(Other definitions for clamour that I've seen before include "Loud and persistent outcry" , "row" , "Uproar" , "Complaints" , "Noisy disturbance" .)

I've seen this clue in The Times.

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