Proposal made for unusually wrapping iron (5)
I believe the answer is:
offer
'proposal' is the definition.
(I've seen this in other clues)
'for unusually wrapping iron' is the wordplay.
'unusually' indicates an anagram.
'wrapping' indicates putting letters inside.
'iron' becomes 'fe' (Fe is the chemical symbol for iron).
'for' is an anagram of 'ofr'.
'ofr' going around 'fe' is 'OFFER'.
'made' acts as a link.
(Other definitions for offer that I've seen before include "(Suggestion of) gift" , "Volunteer, present" , "Proposal; reduced price" , "Provide (an opportunity)" , "show" .)