A sign of aging you take iron to get rid of (7)
I believe the answer is:
wrinkle
'a sign of aging' is the definition.
(I've seen this in another clue)
'you take iron to get rid of' is the wordplay.
I cannot quite see how this works, but
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is located in the answer.
'get' could be 'win' (winning is a kind of getting) and 'win' is found within the leftover letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wrinkle that I've seen before include "Furrow, crease" , "Depression in the smoothness of a surface, skin perhaps" , "clever innovation" , "Valuable hint - handy dodge" , "Crease in skin" .)