Our steel is forged to be firm (8)
I believe the answer is:
resolute
'be firm' is the definition.
(similar in meaning)
'our steel is forged' is the wordplay.
'is forged' indicates an anagram.
'our'+'steel'='oursteel'
'oursteel' is an anagram of 'RESOLUTE'.
'to' acts as a link.
(Other definitions for resolute that I've seen before include "Determined, firm" , "Determined, unwavering" , "in a determined manner" , "Reels out (anag.)" , "Firm in purpose" .)