Many can be urged to work hard (6)
I believe the answer is:
drudge
'work hard' is the definition.
'drudge' can be an answer for 'work' (drudging is a kind of working). I'm not sure about the 'hard' bit.
'many can be urged' is the wordplay.
'many' becomes 'd' (Roman numeral for 500).
'can be' is an anagram indicator.
'urged' is an anagram of 'rudge'.
'd'+'rudge'='DRUDGE'
'to' is the link.
Can you help me to learn more?
(Other definitions for drudge that I've seen before include "Hack - slave" , "Person who does dull menial work" , "One does long and boring work" , "skivvy" , "One who does dull or menial work" .)