Something handed out for daughters to tuck into — it's child's play (6)
I believe the answer is:
doddle
'it's child's play' is the definition.
(both can mean something very easy)
'something handed out for daughters to tuck' is the wordplay.
I cannot really understand how this works, but
'daughters' could be 'dd' (two abbreviations for daughter) and 'dd' is present in the answer.
'something handed out' could be 'dole' (dole can mean government benefits) and 'dole' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'into' acts as a link.
(Other definitions for doddle that I've seen before include "Absurdly simple" , "Easy crossword?" , "In slang, an easy task" , "Snip" , "pushover" .)