Crossword Genius

Rat's fault (6)

Ross

I believe the answer is:

defect

I believe this is a double definition.

'rat's' is the first definition.
(thesaurus)

'fault' is the second definition.
(I've seen this before)

(Other definitions for defect that I've seen before include "Want or imperfection" , "Join opponents in a cause" , "Abandon one's country in favour of an opposing one" , "'Flaw, imperfection (6)'" , "change allegiance" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app