Grab a cipher, embracing calculators (5)
I believe the answer is:
abaci
'calculators' is the definition.
(abacus is a kind of calculator)
'grab a cipher embracing' is the wordplay.
'embracing' indicates the answer is hidden within the clue (the solution is embraced by words in the clue).
'ABACI' is hidden within 'grab a cipher'.
(Other definitions for abaci that I've seen before include "These help with numbers" , "They can be counted on" , "Counting devices" , "Counting-frames" , "sliding scales for calculation?" .)