Government official put burden on staff (6)
I believe the answer is:
taxman
'government official' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'burden on staff' is the wordplay.
'burden' becomes 'tax' (I've seen this before).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'staff' becomes 'man' (as in staffing or manning a particular place).
'tax'+'man'='TAXMAN'
'put' acts as a link.
Can you help me to learn more?
(Another definition for taxman that I've seen is " Duty officer".)