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Record by socialist got thinner (7)

Ross

I believe the answer is:

tapered

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'got thinner' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'record by socialist' is the wordplay.
'record' becomes 'tape' (taping record is a kind of recording).
'by' means one lot of letters go next to another.
'socialist' becomes 'red' (red is a kind of socialist).
'tape'+'red'='TAPERED'

Can you help me to learn more?

(Other definitions for tapered that I've seen before include "Gradually narrowing" , "Coming to a point" , "Narrowing towards one end" , "Becoming narrower towards one end" , "Became gradually narrower as candle may" .)

I've seen this clue in The Mirror.
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