Bending double almost hurt (8)
I believe the answer is:
twisting
'bending' is the definition.
('twist' can be a synonym of 'bend')
'double almost hurt' is the wordplay.
'double' becomes 'twin' (I've seen this in another clue).
'almost' means to remove the last letter (most of the word but not all of it).
'hurt' becomes 'sting' (if something stings, it hurts).
'twin' with its last letter removed is 'twi'.
'twi'+'sting'='TWISTING'
(Other definitions for twisting that I've seen before include "Full of bends" , "Interlacing; turning" , "Distorting, turning" , "Winding (together); distorting" , "Crooked" .)