Security, for example, involving iron anklet ultimately (6)
I believe the answer is:
safety
'security' is the definition.
(thesaurus)
'for example involving iron anklet ultimately' is the wordplay.
'for example' becomes 'say' (I've seen this before).
'involving' indicates putting letters inside.
'iron' becomes 'fe' (Fe is the chemical symbol for iron).
'ultimately' suggests the final letters.
The final letter of 'anklet' is 't'.
'fe'+'t'='fet'
'say' enclosing 'fet' is 'SAFETY'.
(Other definitions for safety that I've seen before include "Opposite of danger" , "immunity" , "Sort of catch" , "shot in game" , "State of security" .)