Admirer has diamonds, maybe, and gold! (6)
I believe the answer is:
suitor
'admirer' is the definition.
(suitor is a kind of admirer)
'diamonds maybe and gold' is the wordplay.
'diamonds maybe' becomes 'suit' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'suit'+'or'='SUITOR'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for suitor that I've seen before include "Wooer" , "Man who is courting a woman" , "Prospective husband" , "He woos a maid" , "He pays court to a woman" .)