Thus, at half time, there's still a part to come (4)
I believe the answer is:
some
'still a part to come' is the definition.
I can't tell whether this defines the answer.
'thus at half time' is the wordplay.
'thus' becomes 'so' (synonyms).
'at' is a charade indicator (letters next to each other).
'half' suggests halving the letters.
'time' with half the letters taken is 'me'.
'so'+'me'='SOME'
'there's' is the link.
Can you help me to learn more?
(Other definitions for some that I've seen before include "An undetermined number" , "Several" , "A little; not a little" , "Part" , "An unspecified quantity, not all" .)