The corner at the end of the street seems occupied (3)
I believe the answer is:
let
'occupied' is the definition.
(I've seen this in another clue)
'the corner at the end of the street' is the wordplay.
'the corner' becomes 'le' (I can't explain this - if you can you should give a lot more credence to this answer).
'at the end of' says to take the final letters.
The final letter of 'street' is 't'.
'le'+'t'='LET'
'seems' is the link.
Can you help me to learn more?
(Other definitions for let that I've seen before include "Disappoint or fail to support - ... down" , "Allow the obstruction" , "Rent out (property)" , "Allowed or rented out" , "inefficient service" .)