Remove, I see, roughly about ninety (6)
I believe the answer is:
excise
'remove' is the definition.
(I've seen this before)
'i see roughly about ninety' is the wordplay.
'roughly' is an anagram indicator.
'about' means one lot of letters goes inside another.
'ninety' becomes 'XC' (Roman numerals).
'i'+'see'='isee'
'isee' with letters rearranged gives 'eise'.
'eise' placed around 'xc' is 'EXCISE'.
(Other definitions for excise that I've seen before include "Duty; cut out" , "Tax on certain goods and commodities" , "Cut out; commodity tax" , "A tax to be cut out, perhaps" , "Customs" .)