Urge to use an iron (5)
I believe the answer is:
press
I believe this is a double definition.
'urge' is the first definition.
(I know that urge can be written as press)
'use an iron' is the second definition.
(I've seen this in another clue)
'to' is the link.
(Other definitions for press that I've seen before include "Jam" , "Iron - clasp - newspapers" , "flock" , "Railroad" , "Crush; iron" .)