Small, silver-grey belt (4)

I believe the answer is:

sash

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'belt' is the definition.
(sash is a type of belt)

'small silver-grey' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'silver grey' becomes 'ash' (ash is a shade of grey. I am not sure about the 'silver' bit.).
's'+'ash'='SASH'

Can you help me to learn more?

(Other definitions for sash that I've seen before include "Window frame - shoulder band" , "Decorative belt" , "Frame for a windowpane" , "Part of a window - decoration" , "Ribbon as a symbol of rank" .)

I've seen this clue in The Telegraph.

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