Thus, at half time, it means there's more to come (4)
I believe the answer is:
some
'there's more to come' is the definition.
I can't tell whether this defines the answer.
'thus at half time it' is the wordplay.
'thus' becomes 'so' (synonyms).
'at' is a charade indicator (letters next to each other).
'half' suggests halving the letters.
'time' becomes 'am'.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'am' cut in half is 'm'.
'so'+'m'+'e'='SOME'
'means' acts as a link.
Can you help me to learn more?
(Other definitions for some that I've seen before include "An unspecified quantity, not all" , "Unknown or unspecified amount or number" , "Undefined number" , "An undetermined number" , "A little; not a little" .)