Perhaps Elizabeth caught person with key bounding to work (5,5)
I believe the answer is:
clock tower
'perhaps elizabeth' is the definition.
(the tower often called Big Ben is Elizabeth Tower)
'caught person with key bounding to work' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'person with key' becomes 'locker'.
'bounding' indicates putting letters inside.
'work' becomes 'w' (physics abbreviation).
'to'+'w'='tow'
'locker' enclosing 'tow' is 'locktower'.
'c'+'locktower'='CLOCK TOWER'
(Other definitions for clock tower that I've seen before include "Big Ben, for example" , "will it hold up the enemy's progress?" , "one looked up to for a time?" .)