Tasty paste from West Asia used all round Britain (6)
I believe the answer is:
wasabi
'tasty paste' is the definition.
'wasabi' can be an answer for 'paste' (I've seen this before). I'm not sure about the 'tasty' bit.
'west asia used all round britain' is the wordplay.
'west' becomes 'W' (abbreviation).
'used' is an anagram indicator.
'all round' is an insertion indicator.
'britain' becomes 'B' (common abbreviation as in GB).
'asia' anagrammed gives 'asai'.
'asai' placed around 'b' is 'asabi'.
'w'+'asabi'='WASABI'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for wasabi that I've seen before include "Flavouring used in Japanese cuisine" , "Strong-tasting Japanese paste" , "'Japanese plant, often eaten with raw fish (6)'" , "Hot Japanese paste" , "Sushi condiment" .)