You’re lucky if he sends you fifty quid (5)

I believe the answer is:

ernie

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'you're lucky if he sends you fifty quid' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for ernie that I've seen before include "Sergeant Bilko, for one" , "Selector of winning premium bond numbers" , "Old computer" , "National Savings computer" , "Els, for example" .)

I've seen this clue in the Evening Standard.

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