I say, 'Bravo Barney' and you raise it disapprovingly (7)
I believe the answer is:
eyebrow
'i say bravo barney' is the definition.
I can't tell whether this definition defines the answer.
'you raise it disapprovingly' is the wordplay.
'you' becomes 'ye' (historical version of 'you').
'raise' shows that the letters should be reversed in order.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'disapprovingly' becomes 'brow' (I can't explain this - if you can you should give a lot more credence to this answer).
'ye' written backwards gives 'ey'.
'ey'+'e'+'brow'='EYEBROW'
'and' is the link.
Can you help me to learn more?
(Other definitions for eyebrow that I've seen before include "One of two hairy facial features" , "Facial hair (that can be raised)" , "What's raised in surprise" , "something going up doubtfully" , "feature one might raise?" .)