Odd piles incredibly asymmetrical (8)
I believe the answer is:
lopsided
'asymmetrical' is the definition.
(similar in meaning)
'odd piles incredibly' is the wordplay.
'incredibly' indicates an anagram.
'odd'+'piles'='oddpiles'
'oddpiles' anagrammed gives 'LOPSIDED'.
(Other definitions for lopsided that I've seen before include "not evenly distributed" , "Unbalanced" , "Crooked" , "Askew, awry" , "Ill-balanced" .)