Crossword Genius

Small, silvery new parts (5)

Ross

I believe the answer is:

sprat

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'small silvery new parts' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'new parts' is the wordplay.
'new' is an anagram indicator.
'parts' anagrammed gives 'SPRAT'.

Can you help me to learn more?

(Other definitions for sprat that I've seen before include "Small food fish" , "Traps for small fish" , "Couple sharing meat" , "It's set to catch a mackerel" , "Jack --, non-fat eater" .)

I've seen this clue in the Evening Standard.
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