Potential pile boss constructed (8)
I believe the answer is:
possible
'potential' is the definition.
(I know that potential can be written as possible)
'pile boss constructed' is the wordplay.
'constructed' indicates an anagram.
'pile'+'boss'='pileboss'
'pileboss' is an anagram of 'POSSIBLE'.
(Other definitions for possible that I've seen before include "Conceivable, practicable" , "Potential" , "Capable of happening" , "Conceivable, imaginable" , "Capable of being achieved" .)