Crude furniture items help with calculations (3,6)
I believe the answer is:
log tables
'crude furniture' is the definition.
'log tables' can be an answer for 'furniture' (I have seen 'Rustic furniture' mean 'log tables' so perhaps 'furniture' could also mean 'log tables'). I am not sure about the 'crude' bit.
'items help with calculations' is the wordplay.
I cannot really understand how this works, but
'items' could be 'tables' (I have seen 'Items of furniture ' mean 'tables' so perhaps 'items' could also mean 'tables') and 'tables' is found within the answer.
The remaining letters 'log' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for log tables that I've seen before include "not needed with calculators" , "Wooden furniture" , "no longer used in school" , "used by old-fashioned mathematicians" , "Rustic furniture" .)