Things ruin sodden salads — this could be one of them (8,6,8)

I believe the answer is:

thousand island dressing

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'things ruin sodden salads this could be one of them' is the definition.
The definition suggests a singular noun which matches the answer.

'ruin sodden salads this could be one of them' is the wordplay.
'could be' indicates anagramming the letters.
'one of them' becomes 'ng' (I can't justify this - if you can you should believe this answer much more).
'ruin'+'sodden'+'salads'+'this'='ruinsoddensaladsthis'
'ruinsoddensaladsthis' is an anagram of 'thousandislanddressi'.
'thousandislanddressi'+'ng'='THOUSAND ISLAND DRESSING'

Can you help me to learn more?

(Other definitions for thousand island dressing that I've seen before include "Relish" , "Salad topping" , "mayonnaise sauce - with 8a" .)

I've seen this clue in The Times.

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