Come down on workers and their offspring? (11)
I believe the answer is:
descendants
'offspring?' is the definition.
(thesaurus)
'come down on workers' is the wordplay.
'come down' becomes 'descend' (synonyms).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'workers' becomes 'ants' (worker ants).
'descend'+'ants'='DESCENDANTS'
'and their' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for descendants that I've seen is " Grandkids, e.g.".)