Such tablets can be taken in pairs (7)
I believe the answer is:
aspirin
'such tablets can' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'taken in pairs' is the wordplay.
'in pairs' anagrams to 'ASPIRIN'.
But, I am not clear how the anagram is indicated.
'be' is the link.
Can you help me to learn more?
(Other definitions for aspirin that I've seen before include "Commonly used pain-killer" , "Common pain tablet" , "number" , "Common painkiller" , "Pain-relieving tablet" .)