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' indicates anagramming the letters.
'about' is an insertion indicator.
'ninety' becomes 'xc' ('xc' can be a synonym of 'ninety').
'i'+'see'='isee'
'isee' anagrammed gives 'eise'.
'eise' going 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" .)