Defence in question again (7)
I believe the answer is:
redoubt
This clue is a double definition.
'defence' is the first definition.
(redoubt is a kind of defence)
'question again' is the second definition.
('doubt' is an answer for 'question' so perhaps 'redoubt' is OK for 'question again')
'in' acts as a link.
(Other definitions for redoubt that I've seen before include "Entrenched stronghold" , "In final retreat" , "Military defence-work" , "Defensive outwork" , "Keep losing confidence in" .)