Diamonds, perhaps, and gold for one seeking hand (6)
I believe the answer is:
suitor
'one seeking hand' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'diamonds perhaps and gold' is the wordplay.
'diamonds perhaps' becomes 'suit' (diamonds is a playing card suit).
'and' is a charade indicator (letters next to each other).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'suit'+'or'='SUITOR'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for suitor that I've seen before include ". . . he woos his girl" , "Wooer" , "It's our (anag) - admirer" , "A man wooing" , "Man pursuing a woman for marriage" .)