Bear loses right to invest (5)
I believe the answer is:
endue
'to invest' is the definition.
(synonyms)
'bear loses right' is the wordplay.
I cannot quite understand how this works, but
'right' could be 'due' (due is a kind of right) and 'due' is located in the answer.
The remaining letters 'en' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
(Other definitions for endue that I've seen before include "Endow (poetic)" , "Clothe" , "Invest - provide" , "Furnish" , "Invest (something) with a quality or ability" .)