Control device overlooking street furthest away (8)
I believe the answer is:
remotest
'furthest away' is the definition.
I can't tell whether this definition defines the answer.
'control device overlooking street' is the wordplay.
'control device' becomes 'remote' (I am not sure about this - if you are sure you should believe this answer much more).
'overlooking' means one lot of letters go next to another (in a down clue, some letters go above others).
'street' becomes 'st' (abbreviation).
'remote'+'st'='REMOTEST'
Can you help me to learn more?
(Other definitions for remotest that I've seen before include "Terse mot (anag)" , "Furthest away, most distant" .)