Defence group quite upset and anxious (7)

I believe the answer is:
unquiet
'anxious' is the definition.
(synonyms)
'defence group quite upset' is the wordplay.
'defence group' becomes 'un' (I can't justify this - if you can you should give a lot more credence to this answer).
'upset' is an anagram indicator.
'quite' with letters rearranged gives 'quiet'.
'un'+'quiet'='UNQUIET'
'and' is the link.
Can you help me to learn more?
(Another definition for unquiet that I've seen is " Disturbed and restless".)
I've seen this clue in The Mirror.
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