Have a go at unpopular stew (6)
I believe the answer is:
ragout
'stew' is the definition.
(ragout is a kind of stew)
'have a go at unpopular' is the wordplay.
'have a go at' becomes 'rag' (I can't explain this - if you can you should believe this answer much more).
'unpopular' becomes 'out' (similar in meaning).
'rag'+'out'='RAGOUT'
Can you help me to learn more?
(Other definitions for ragout that I've seen before include "Spicy meat stew" , "Temper showing? No, it's a stew" , "Seasoned dish of stewed meat and vegetables" , "something spicy?" , "Stew of meat and veg" .)