Remove underwear and ask for information after operation (7)
I believe the answer is:
debrief
'ask for information after operation' is the definition.
(eg debriefing a secret agent)
'remove underwear' is the wordplay.
'remove' becomes 'de' (I've seen this in other clues).
'underwear' becomes 'brief' (I can't explain this - if you can you should believe this answer much more).
'de'+'brief'='DEBRIEF'
'and' is the link.
Can you help me to learn more?
(Other definitions for debrief that I've seen before include "get the full story" , "Question (soldier) after a mission" , "Interview after mission (to gather information)" , "Get information from (a returning soldier)" , "Get mission statement" .)