Calculator’s standard on decline (5,4)
I believe the answer is:
slide rule
'calculator's' is the definition.
(I've seen this before)
'standard on decline' is the wordplay.
I cannot really understand how this works, but
'standard' could be 'rule' (synonyms) and 'rule' is located in the answer.
'decline' could be 'slide' (I've seen this before) and 'slide' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for slide rule that I've seen before include "old computer" , "Instrument for rapid calculations" , "Logs on here" , "Old calculator" , "facilitates calculations" .)
