US government dept wanting redesign, receives crest (6,7)
I believe the answer is:
secret service
'us government dept' is the definition.
I can't judge whether this definition defines the answer.
'redesign receives crest' is the wordplay.
'redesign' indicates an anagram (I've seen 'redesigned' mean this).
'receives'+'crest'='receivescrest'
'receivescrest' with letters rearranged gives 'SECRET SERVICE'.
'wanting' is the link.
Can you help me to learn more?
(Other definitions for secret service that I've seen before include "MI5 or MI6 (informal)" , "Spies' department" , "Government department involved in espionage" , "Government agency" , "Spying agency" .)