Thanks for the bit of stew - what flavour! (5)
I believe the answer is:
taste
'flavour' is the definition.
(I've seen this before)
'thanks for the bit of stew what' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'for' is a charade indicator (letters next to each other).
'the bit of' says to take the initial letters.
'what' becomes 'te' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'stew' is 's'.
'ta'+'s'+'te'='TASTE'
Can you help me to learn more?
(Other definitions for taste that I've seen before include "Preference" , "Flavour or discrimination" , "Savour in the mouth" , "Try (food)" , "Sample - discrimination" .)