The initial question is put with vigour and detachment (4,5)
I believe the answer is:
task force
'detachment' is the definition.
(thesaurus)
'the initial question is put with vigour' is the wordplay.
'initial' indicates taking the first letters.
'question' becomes 'ask' (asking a question).
'is put' says to put letters next to each other.
'with vigour' becomes 'force' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'the' is 't'.
't'+'ask'+'force'='TASK-FORCE'
'and' is the link.
Can you help me to learn more?
(Other definitions for task force that I've seen before include "Squad for undertaking" , "Military group" , "Group specially organised for particular operation" , "Group specially organised for particular assignment" , "Group for special operation" .)