Zero improve — how might medicine be taken? (6)
I believe the answer is:
orally
'might medicine be taken?' is the definition.
I can't tell whether this definition defines the answer.
'zero improve' is the wordplay.
'zero' becomes 'O' (O resembles 0).
'improve' becomes 'rally' (I can't explain this - if you can you should give a lot more credence to this answer).
'o'+'rally'='ORALLY'
'how' acts as a link.
Can you help me to learn more?
(Other definitions for orally that I've seen before include "via the trap" , "as auditions are done" , "How one speaks" , "How anyone would speak" , "given by mouth" .)