Speculator, one believing gold to be within his grasp? (8)
I believe the answer is:
theorist
'speculator' is the definition.
(I've seen this before)
'one believing gold to be within his grasp?' is the wordplay.
I cannot really understand how this works, but
'one' could be 'the' (both can introduce a definite example of something) and 'the' is found in the answer.
'gold' could be 'or' ('or' is the heraldic name for gold) and 'or' is found within the answer.
The remaining letters 'ist' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for theorist that I've seen before include "Expert in established hypotheses" , "Creator of hypothesis" , "An expert in abstract principles" , "Thinker" , "Speculator" .)