Unusual urge to put iron back inside safe place (6)
I believe the answer is:
refuge
'safe place' is the definition.
'unusual urge to put iron back inside' is the wordplay.
'unusual' indicates an anagram.
'to put iron back' becomes 'ef' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'inside' is an insertion indicator.
'urge' with letters rearranged gives 'ruge'.
'ruge' enclosing 'ef' is 'REFUGE'.
(Other definitions for refuge that I've seen before include "Shelter or protection from danger or trouble" , "Traffic island" , "'Sanctuary, asylum (6)'" , "we aim for on the way?" , "The sort of shelter" .)