Something advantageous, like false teeth, say (5)
I believe the answer is:
asset
'something' is the definition.
(I have seen 'Something of worth ' mean 'asset' so perhaps 'something' could also mean 'asset')
'advantageous like false teeth say' is the wordplay.
I cannot quite see how this works, but
'like' could be 'as' and 'as' is found within the answer.
The remaining letters 'set' 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 asset that I've seen before include "Valuable possession, worth having" , "Boon" , "Useful or valuable quality or possession" , "Useful item" , "Item conferring advantage" .)