Gleaming ring held inside worth a lot (4)
I believe the answer is:
halo
'gleaming ring' is the definition.
'halo' can be an answer for 'ring' (synonyms). I'm not sure about the 'gleaming' bit.
'held inside worth a lot' is the wordplay.
'held' says the answer is hidden in the clue.
'HALO' is hidden in the letters of 'inside worth a lot'.
Can you help me to learn more?
(Other definitions for halo that I've seen before include "Sign of sainthood" , "overhead lighting?" , "Circle over a saint" , "Crown" , "Ring (around sun or moon)" .)