Request one by one making a good impression (10)

I believe the answer is:

pleasingly

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'making a good impression' is the definition.
I can't tell whether this definition defines the answer.

'request one by one' is the wordplay.
'request' becomes 'plea' (plea is a kind of request).
'one by one' becomes 'singly' (synonyms).
'plea'+'singly'='PLEASINGLY'

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I've seen this clue in The Telegraph.

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