Maurice has a heart of gold (5)
I believe the answer is:
auric
'of gold' is the definition.
(auric means relating to gold)
'maurice has' is the wordplay.
'has' says the answer is hidden in the clue.
'AURIC' is hidden within 'maurice'.
'a heart' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for auric that I've seen before include "Golden" , "Pertaining to gold" , "Relating to a form of gold" , "made of gold" , "- Goldfinger (Bond)" .)