Starts saving today as kids expect support (5)
I believe the answer is:
stake
'support' is the definition.
(I have seen 'stout support' mean 'stake' so perhaps 'support' could also mean 'stake')
'starts saving today as kids expect' is the wordplay.
'starts' says to take the initial letters.
The first letters of 'saving today as kids expect' is 'STAKE'.
(Other definitions for stake that I've seen before include "Financial interest" , "Share (in a business); post" , "Ante, bet" , "Amount bet" , "The money risked on a gamble" .)