Arrest English rose taking drug on Sunday (7)
I believe the answer is:
engross
'arrest' is the definition.
(thesaurus)
'english rose taking drug on sunday' is the wordplay.
'english' becomes 'eng'.
'taking' indicates named letters should be taken away.
'drug' becomes 'e' (e is another name for ecstasy).
'on sunday' becomes 's' (I am not sure about the 'on' bit.**).
'rose' with 'e' taken out is 'ros'.
'eng'+'ros'+'s'='ENGROSS'
(Other definitions for engross that I've seen before include "Completely absorb" , "Rivet" , "Engulf" , "Absorb, captivate" , "Occupy attention fully, absorb" .)