I toddle -- dislocated muscle (7)
I believe the answer is:
deltoid
'muscle' is the definition.
(deltoid is a kind of muscle)
'i toddle dislocated' is the wordplay.
'dislocated' is an anagram indicator.
'i'+'toddle'='itoddle'
'itoddle' with letters rearranged gives 'DELTOID'.
(Other definitions for deltoid that I've seen before include "Triangular shoulder muscle - old diet (anag)" , "Large triangular muscle that covers shoulder and raises arm" .)