Flooding, with one sister (not Ida) affected (10)

I believe the answer is:

inundation

'flooding' is the definition.
(thesaurus)

'one sister not ida affected' is the wordplay.
'one' becomes 'i' (Roman numeral).
'sister' becomes 'nun' (I've seen this before).
'affected' is an anagram indicator.
'not'+'ida'='notida'
'notida' is an anagram of 'dation'.
'i'+'nun'+'dation'='INUNDATION'

'with' is the link.

(Another definition for inundation that I've seen is " Flood".)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app