Sarah got work in Shropshire, once (5)

I believe the answer is:

salop

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'shropshire once' is the definition.
I can't tell whether this definition defines the answer.

'sarah got work' is the wordplay.
'sarah' becomes 'Sal' (Sally is a common pet form of Sarah).
'got' is a charade indicator (letters next to each other).
'work' becomes 'op' (common abbreviation for 'opus').
'sal'+'op'='SALOP'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for salop that I've seen before include "Shropshire (abbr.)" , "Telford here" , "Shropshire (abbreviation)" , "Shropshire in short" , "Alternative name for the county of Shropshire" .)

I've seen this clue in the Evening Standard.

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