Confusing Alan, U-turn that's not normal (9)
I believe the answer is:
unnatural
'not normal' is the definition.
(I've seen this before)
'confusing alan u-turn' is the wordplay.
'confusing' indicates anagramming the letters.
'alan'+'u'+'turn'='alanuturn'
'alanuturn' with letters rearranged gives 'UNNATURAL'.
'that's' acts as a link.
(Other definitions for unnatural that I've seen before include "Lacking normal feelings of, say, affection" , "odd" , "Sharp or flat" , "Affected" , "Abnormal; not spontaneous" .)