Mound of distortions (3)
I believe the answer is:
tor
'mound' is the definition.
(a tor is a rocky mound or hill)
'of distortions' is the wordplay.
'of' indicates the answer is hidden within the clue.
'TOR' is hidden in the letters of 'distortions'.
(Other definitions for tor that I've seen before include "Hill or rocky peak" , "Rising" , "Dartmoor peak" , "eminence" , "Rot on a Cornish hill" .)