Thus, on some days, there's help with the washing (4)
I believe the answer is:
soda
'help with the washing' is the definition.
I can't tell whether this defines the answer.
'thus on some days' is the wordplay.
'thus' becomes 'so' (synonyms).
'on' is a charade indicator (letters next to each other).
'some' becomes 'a' ().
'days' becomes 'd' (abbreviation for days).
'a' after 'd' is 'da'.
'so'+'da'='SODA'
'there's' is the link.
Can you help me to learn more?
(Other definitions for soda that I've seen before include "kind of water" , ""Splashed" drinks mixer" , "pressurised liquid" , "Accompaniment to whisky" , "fizz" .)