Abrasive, turn up with computer equipment (6)
I believe the answer is:
pumice
'abrasive' is the definition.
(I've seen this before)
'turn up with computer equipment' is the wordplay.
'turn' says the letters should be written in reverse.
'with' means one lot of letters go next to another.
'computer equipment' becomes 'mice' (I can't explain this - if you can you should believe this answer much more).
'up' backwards is 'pu'.
'pu'+'mice'='PUMICE'
Can you help me to learn more?
(Other definitions for pumice that I've seen before include "Porous lava" , "Lava stone" , "Mineral" , "Solidified lava used as an abrasive" , "Piece of volcanic rock used as an abrasive" .)