Convoluted spring is two seasons, by the sound of it (10)
I believe the answer is:
somersault
'convoluted spring' is the definition.
'two seasons by the sound of it' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is found in the answer.
This explanation may well be incorrect...
'is' is the link.
Can you help me to learn more?
(Other definitions for somersault that I've seen before include "Perform acrobatic feat" , "Feat of acrobatics" , "policy switch" , "Turn head over heels" , "Move acrobatically" .)