Put the finishing touches to flier that is about tax (8)
I believe the answer is:
titivate
'put the finishing touches to' is the definition.
I can't tell whether this defines the answer.
'flier that is about tax' is the wordplay.
'flier' becomes 'tit' (type of bird).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'about' indicates putting letters inside.
'tax' becomes 'VAT' (Value-Added Tax).
'ie' enclosing 'vat' is 'ivate'.
'tit'+'ivate'='TITIVATE'
Can you help me to learn more?
(Other definitions for titivate that I've seen before include "Smarten (oneself) up" , "Doll oneself up" , "Primp" , "Informally smarten up, put finishing rouches to" , "Smarten up, put finishing touches on" .)