Navy flags without new fashions again (9)
I believe the answer is:
redesigns
'new fashions again' is the definition.
I can't tell whether this definition defines the answer.
'navy flags without' is the wordplay.
'navy' becomes 'N' (common abbreviation eg in RN Royal Navy).
'flags' becomes 'red ensigns'.
'without' indicates named letters should be taken away.
'redensigns' with 'n' taken away is 'REDESIGNS'.
Can you help me to learn more?
(Another definition for redesigns that I've seen is " Makes new arrangement".)