50 in approval having taste (7)
I believe the answer is:
flavour
'taste' is the definition.
(I know that flavour is a type of taste)
'50 in approval' is the wordplay.
I cannot really understand how this works, but
'50' could be 'l' (Roman numeral) and 'l' is found in the answer.
The remaining letters 'favour' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'having' acts as a link.
Can you help me to learn more?
(Other definitions for flavour that I've seen before include "essential quality" , "Distinctive taste" , "property" , "Relish" , "Season" .)