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One who chronicles onslaught repulsed first (7)

Ross

I believe the answer is:

diarist

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'one who chronicles' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'onslaught repulsed first' is the wordplay.
'onslaught' becomes 'raid' (raid is a kind of onslaught).
'repulsed' shows that the letters should be reversed in order.
'first' becomes 'ist' (ist resembles 1st).
'raid' written backwards gives 'diar'.
'diar'+'ist'='DIARIST'

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(Other definitions for diarist that I've seen before include "Pepys, say" , "Frank, say" , "eg Samuel Pepys" , "e.g. John Evelyn" , "One as Evelyn, Kilvert" .)

I've seen this clue in The Sun and The Telegraph.
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