Turn drill off outside and you start in a sensational way (7)
I believe the answer is:
luridly
'in a sensational way' is the definition.
I can't tell whether this definition defines the answer.
'turn drill off outside and you start' is the wordplay.
I cannot really see how this works, but
'turn' could be 'u' (a 'U-turn' is a kind of turn) and 'u' is located in the answer.
an anagram of 'drill' is 'lridl' which is within the remaining letters.
'you start' could be 'y' (I've seen this in other clues) and 'y' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for luridly that I've seen before include "In a very sensational manner" , "Shockingly" , "In melodramatic fashion" , "In macabre fashion" .)