Children the result of two dates (4)
I believe the answer is:
seed
'children' is the definition.
(I've seen this in other clues)
'two dates' is the wordplay.
'two dates' means two substitutions for 'date'.
'date' becomes 'see' (synonyms).
'date' becomes 'd' (common abbreviation eg in DOB, date of birth).
'see'+'d'='SEED'
'the result of' is the link.
(Other definitions for seed that I've seen before include "Beginning; sow (land)" , "Tennis player; germ" , "Initiate the growth of" , "Germ; beginning" , "Top Wimbledon player" .)