New style in navy
I believe the answer is:
modern
'new' is the definition.
(synonyms)
'style in navy' is the wordplay.
'style in' becomes 'mode' (synonyms. I am not sure about the 'in' bit.).
'navy' becomes 'RN' (abbreviation for Royal Navy).
'mode'+'rn'='MODERN'
Can you help me to learn more?
(Other definitions for modern that I've seen before include "Present-day" , "In history, the period or era since the Middle Ages" , "'Contemporary, up-to-the-minute (6)'" , "Fashionable (like the new Tate gallery?)" , "Belonging to the present time" .)