Take down my ruddy trousers! (6)
I believe the answer is:
record
'take down' is the definition.
(thesaurus)
'my ruddy trousers' is the wordplay.
'my' becomes 'cor' (I've seen this in other clues).
'ruddy' becomes 'red' ('red' can be a synonym of 'ruddy').
'trousers' means one lot of letters goes inside another (to trouser can mean to contain or hold).
'cor' going inside 'red' is 'RECORD'.
(Other definitions for record that I've seen before include "Make a single" , "that has been cut" , "Log; disc" , "See 21" , "put down to the occasion" .)