In the Mirror, comic Brand plugs impression of wine (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'in the mirror comic brand plugs impression' is the wordplay.
'in the mirror' shows that the letters should be reversed in order.
'comic brand' becomes 'jo' (comedian Jo Brand. I am not sure about the 'comic' bit.).
'plugs' indicates putting letters inside (plug can mean to fill a gap).
'impression' becomes 'air' (I've seen this before).
'jo' placed into 'air' is 'ajoir'.
'ajoir' in reverse letter order is 'RIOJA'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for rioja that I've seen before include "Popular Spanish wine" , "Dry red wine from Spain" , "Wine from northern Spain" , "Spanish drink" , "Spanish red wine" .)