Golden-hearted believer may provide some ideas (8)
I believe the answer is:
theorist
'may provide some ideas' is the definition.
(a theorist has theories or ideas)
'golden-hearted believer' is the wordplay.
'golden' becomes 'or' ('or' is the name for gold in heraldry).
'hearted' indicates putting letters inside (some letters go to the heart of the word).
'believer' becomes 'theist' (theist is a kind of believer).
'or' going within 'theist' is 'THEORIST'.
(Other definitions for theorist that I've seen before include "Expert in established hypotheses" , "Speculator" , "Abstract reasoner" , "Creator of hypothesis" , "Thinker" .)