Small city company’s artistic technique (5)

I believe the answer is:

secco

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'artistic technique' is the definition.
The definition suggests a singular noun which matches the answer.

'small city company's' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'city' becomes 'EC' (the City of London postcode).
'company' becomes 'co' (abbreviation).
's'+'ec'+'co'='SECCO'

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(Other definitions for secco that I've seen before include "Painting technique on dry plaster" , "unaccompanied?" , "Dry (of wine)" .)

I've seen this clue in The Times.

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