Remove trousers — bad egg to miss a good thrashing (5)
I believe the answer is:
debag
'remove trousers' is the definition.
(I've seen this before)
'bad egg to miss a good thrashing' is the wordplay.
'to miss' is a deletion indicator.
'a good' becomes 'g' (abbreviation).
'thrashing' is an anagram indicator (I've seen this in other clues).
'bad'+'egg'='badegg'
'badegg' with 'g' taken out is 'badeg'.
'badeg' with letters rearranged gives 'DEBAG'.
(Other definitions for debag that I've seen before include "Deprive of trousers" , "Remove (a person's) trousers" , "As a prank remove pants" , "Strip of cords maybe" , "take trousers off" .)