Power making BP a potential victim of oil-spill (5)
I believe the answer is:
prawn
'a potential victim of oil-spill' is the definition.
(prawns might be affected by an oil spill)
'power making bp' is the wordplay.
I cannot really understand how this works, but
'power' could be 'p' (symbol in physics) and 'p' is located in the answer.
The remaining letters 'rawn' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for prawn that I've seen before include "Cocktail ingredient" , "basis for cocktail" , "Large shrimp" , "Bit of seafood" , "Popular oriental snack" .)