Bungled! Apologise, nothing less, for deterioration of goods (8)

'deterioration of goods' is the definition.
The answer and definition can be both natural processes as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'bungled apologise nothing less' is the wordplay.
'bungled' indicates anagramming the letters.
'nothing' becomes 'O' (looks like zero - 0).
'less' indicates named letters should be taken away (less can mean minus).
'apologise' with 'o' taken out is 'aplogise'.
'aplogise' is an anagram of 'SPOILAGE'.

'for' is the link.

Can you help me to learn more?