Farther away from that drilling platform (6)
I believe the answer is:
beyond
'farther away from that drilling platform' is the definition.
'beyond' can be an answer for 'farther' (I've seen this before). I am not sure about the rest of the definition.
'farther away from that drilling' is the wordplay.
'farther away' becomes 'bd' (I can't justify this - if you can you should give a lot more credence to this answer).
'from' becomes 'e' (I've seen this in other clues).
'that' becomes 'yon' (archaic term meaning 'that').
'drilling' indicates putting letters inside.
'e'+'yon'='eyon'
'bd' going around 'eyon' is 'BEYOND'.
Can you help me to learn more?
(Other definitions for beyond that I've seen before include "unknown" , "Farther than or outside" , "Outside the range of" , "On the far side of" , "Past" .)