Iron bar lifted a lid (6)
I believe the answer is:
fedora
'lid' is the definition.
(fedora is a kind of lid)
'iron bar lifted a' is the wordplay.
'iron' becomes 'fe' (Fe is the chemical symbol for iron).
'bar' becomes 'rod' (I've seen this in other clues**).
'lifted' says the letters should be written in reverse (going up in down clue).
'rod' backwards is 'dor'.
'fe'+'dor'+'a'='FEDORA'
(Other definitions for fedora that I've seen before include "Soft hat with band" , "Type of hat" , "Felt hat much loved by 1930s gangsters" , "Headgear" , "Or fade away with man's soft felt hat" .)