Some day, an SOS goes out for refreshments (5)
I believe the answer is:
sodas
'refreshments' is the definition.
(I've seen this in another clue)
'some day an sos goes out' is the wordplay.
'some day' becomes 'd' (abbreviation for day).
'an' becomes 'a'.
'goes out' indicates anagramming the letters.
'd'+'a'+'sos'='dasos'
'dasos' with letters rearranged gives 'SODAS'.
'for' acts as a link.
(Other definitions for sodas that I've seen before include "Fizzy drinks" , "Soft drinks" .)