You can take them in pairs (7)
I believe the answer is:
aspirin
'you can' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'them in pairs' is the wordplay.
'in pairs' can be anagrammed to 'ASPIRIN'.
However, I'm not sure how the anagram is indicated.
'take' acts as a link.
Can you help me to learn more?
(Other definitions for aspirin that I've seen before include "Pain-relief drug" , "headache cure" , "number" , "Synthetic analgesic" , "Pain-relieving drug made in Paris" .)