See bolts levered out from vandalised letterboxes (6)
I believe the answer is:
exeter
'see' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for exeter that I've seen before include "SW county town" , "English cathedral city" , "Devon's county town" , "One making an advance" , "Devonshire city" .)