Spring routine restricted by extremely elaborate footwear (10)
I believe the answer is:
espadrille
'footwear' is the definition.
(espadrille is a kind of footwear)
'spring routine restricted by extremely elaborate' is the wordplay.
'spring' becomes 'spa' (spa can mean a mineral spring).
'routine' becomes 'drill' (you know the drill).
'restricted by' means one lot of letters goes inside another (inserted letters are restricted or trapped).
'extremely' means to remove the middle letters (only the extremes of the word are used).
'elaborate' with its centre taken out is 'ee'.
'spa'+'drill'='spadrill'
'spadrill' going within 'ee' is 'ESPADRILLE'.
(Other definitions for espadrille that I've seen before include "sandal!" , "goes on foot" , "[SHOE], made casually" , "Cord-soled shoe" , "Plaited fibres in its sole" .)