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)
'take iron to get rid of' is the wordplay.
I cannot quite understand how this works, but
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is found in the answer.
'get' could be 'win' (winning is a kind of getting) and 'win' is found in the remaining letters.
This explanation may well be incorrect...
'you' is the link.
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" .)