Wise tip from beau in poor taste (6)
I believe the answer is:
astute
'wise' is the definition.
(astute means wise or shrewd)
'tip from beau in poor taste' is the wordplay.
'tip from beau' becomes 'u' (I can't justify this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
'poor' indicates anagramming the letters.
'taste' is an anagram of 'astte'.
'u' inserted within 'astte' is 'ASTUTE'.
Can you help me to learn more?
(Other definitions for astute that I've seen before include "Shrewd and sagacious" , "Shrewd, quick to spot advantage" , "Able to assess (people or situations) accurately" , "Statue (anag)" , "Sharp-witted" .)