Crossword Genius

Scrap old pieces covered in banned pesticide (7)

Ross

I believe the answer is:

oddment

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'scrap' is the definition.
(synonyms)

'old pieces covered in banned pesticide' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'pieces' becomes 'men' (man can mean a chess piece).
'covered in' is an insertion indicator.
'banned pesticide' becomes 'ddt' (I can't explain this - if you can you should give a lot more credence to this answer).
'men' going into 'ddt' is 'ddment'.
'o'+'ddment'='ODDMENT'

Can you help me to learn more?

(Other definitions for oddment that I've seen before include "a bit spare" , "Remnant" , "Leftover piece" , "Leftover item" , "Just a bit left" .)

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