Most of expedition taken in by civic virtue (8)
I believe the answer is:
chastity
'virtue' is the definition.
(synonyms)
'most of expedition taken in by civic' is the wordplay.
'most of' means to remove the last letter.
'expedition' becomes 'haste' (expedition is expediting, doing something quickly).
'taken in by' means one lot of letters goes inside another.
'civic' becomes 'city' (I can't explain this - if you can you should give a lot more credence to this answer).
'haste' with its last letter taken off is 'hast'.
'hast' inserted within 'city' is 'CHASTITY'.
Can you help me to learn more?
(Other definitions for chastity that I've seen before include "Sexual abstinence" , "Sexual purity" , "Virginity" , "Pure character" , "Abstention from carnal activity" .)