In truth, rice paper may be used three times (6)
I believe the answer is:
thrice
'three times' is the definition.
(synonyms)
'in truth rice paper' is the wordplay.
'in' indicates a hidden word.
'THRICE' is hidden in the letters of 'truth rice paper'.
'may be used' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for thrice that I've seen before include "In threefold degree" , "Three-time" , "Once, once more and yet once more" , "Archaic word for three times" , "Old usage for three times" .)