Equally, at half time, it's not a hundred per cent (4)
I believe the answer is:
some
'not a hundred per cent' is the definition.
I can't judge whether this defines the answer.
'equally at half time' is the wordplay.
'equally' becomes 'so' (I can't explain this - if you can you should give a lot more credence to this answer).
'at' says to put letters next to each other.
'half' indicates taking half.
'time' halved is 'me'.
'so'+'me'='SOME'
'it's' is the link.
Can you help me to learn more?
(Other definitions for some that I've seen before include "Several" , "An unspecified quantity, not all" , "Part" , "certain" , "Undefined number" .)