Bob tells Tom about navy dress (4-7)
I believe the answer is:
bell-bottoms
'bob tells tom about navy dress' is the definition.
I can't judge whether this definition defines the answer.
'bob tells tom about' is the wordplay.
'about' indicates anagramming the letters.
'bob'+'tells'+'tom'='bobtellstom'
'bobtellstom' anagrammed gives 'BELL-BOTTOMS'.
Can you help me to learn more?
(Other definitions for bell-bottoms that I've seen before include "Wide-flared trousers" , "Trousers with a flare below the knee" , "Flared trousers" , "Naval rating's trousers" , "Sailor's trousers" .)