Abnormal errant Lear put out (13)
I believe the answer is:
preternatural
'abnormal' is the definition.
(I've seen this before)
'errant lear put out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'errant'+'lear'+'put'='errantlearput'
'errantlearput' is an anagram of 'PRETERNATURAL'.
(Other definitions for preternatural that I've seen before include "Abnormal" , "Weird - extraordinary" , "Very unusual" , "beyond what's normal" .)