Crossword Genius

Quietly furious one's stealing from work (6)

Ross

I believe the answer is:

pirate

I'm a little stuck... Click here to teach me more about this clue!

'one's stealing from work' is the definition.
I can't tell whether this definition defines the answer.

'quietly furious' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'furious' becomes 'irate' (I've seen this before).
'p'+'irate'='PIRATE'

Can you help me to learn more?

(Other definitions for pirate that I've seen before include "Maritime robber" , "Hook for one" , "Criminal on the high seas" , "Silver, perhaps" , "One who infringes another's copyright" .)

I've seen this clue in The Sun.
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