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' says the answer is hidden in the clue.
'TOR' is hidden within 'distortions'.
(Other definitions for tor that I've seen before include "Hill or rocky peak" , "Rising" , "Dartmoor peak" , "eminence" , "Rot on a Cornish hill" .)