Crossword Genius

Hard worker in the city sacked long ago (6)

Ross

I believe the answer is:

trojan

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'hard worker' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trojan that I've seen before include "Computer threat" , "This legendary horse was wooden and hollow" , "This Horse was a hollow invader" , "This horse once concealed Greek warriors bent on breaking a siege" , "Native of Troy" .)

I've seen this clue in The Globe and Mail.
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