No dancer recalled mistake about line further down (10)
I believe the answer is:
wallflower
'no dancer' is the definition.
(wallflower can mean someone too shy to dance)
'recalled mistake about line further down' is the wordplay.
'recalled' is a reversal indicator.
'mistake' becomes 'flaw'.
'about' is an insertion indicator.
'line' becomes 'l'.
'further down' becomes 'lower' (I've seen this before).
'flaw' going around 'l' is 'fllaw'.
'fllaw' written backwards gives 'wallf'.
'wallf'+'lower'='WALLFLOWER'
(Other definitions for wallflower that I've seen before include "One lacking a partner - garden plant" , "attracts no attention" , "Non-participant" , "Person waiting in vain to be asked to dance" , "shy sort" .)