The gold rings are different (5)
I believe the answer is:
other
'different' is the definition.
(similar in meaning)
'the gold rings are' is the wordplay.
'the gold' becomes 'or' ('or' is the heraldic name for gold).
'rings' indicates putting letters inside.
'are' becomes 'the' (I can't justify this - if you can you should give a lot more credence to this answer).
'or' going around 'the' is 'OTHER'.
Can you help me to learn more?
(Other definitions for other that I've seen before include "Remaining" , "Alternative of two" , "Throe (anag)" , "Different; alternate" , "Second" .)