State about iron model’s security (6)
I believe the answer is:
safety
'security' is the definition.
(I've seen this before)
'state about iron model's' is the wordplay.
'state' becomes 'say' (say is a kind of state).
'about' is an insertion indicator.
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'model' becomes 't' (Ford Model T car).
'fe'+'t'='fet'
'say' going around 'fet' is 'SAFETY'.
(Other definitions for safety that I've seen before include "condition of 18 [AIRWORTHINESS]" , "Freedom from risk or danger, or an acrobat's net" , "one finds in numbers" , "Refuge" , "Type of match or valve" .)