Heel when wobbly tilts toe (8)
I believe the answer is:
stiletto
'heel' is the definition.
(stiletto heel is a kind of heel)
'wobbly tilts toe' is the wordplay.
'wobbly' indicates an anagram (I've seen this in other clues).
'tilts'+'toe'='tiltstoe'
'tiltstoe' is an anagram of 'STILETTO'.
'when' is the link.
(Other definitions for stiletto that I've seen before include "Dagger; tapered heel" , "Type of shoe" , "Possible cause of stabbing pains" , "Small dagger and high narrow heel" , "Long dagger" .)