See, front door key’s rusty at the edges (6)
I believe the answer is:
descry
'see' is the definition.
(I've seen this before)
'front door key's rusty at the edges' is the wordplay.
'front' indicates taking the first letters.
'key' becomes 'esc' ('Escape' key on a computer keyboard).
'at the edges' means to remove the middle letters.
'rusty' with its middle taken out is 'ry'.
The first letter of 'door' is 'd'.
'd'+'esc'+'ry'='DESCRY'
(Other definitions for descry that I've seen before include "Catch sight of (poetic)" , "Perceive - make out" , "See" .)