Crossword Genius

Professional attack — always make a quick killing (9)

Ross

I believe the answer is:

profiteer

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'a quick killing' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'professional attack always' is the wordplay.
'professional' becomes 'pro' (abbreviation).
'attack' becomes 'fit' (fit is a kind of attack).
'always' becomes 'eer' (poetic way of saying ever).
'pro'+'fit'+'eer'='PROFITEER'

'make' acts as a link.

Can you help me to learn more?

(Other definitions for profiteer that I've seen before include "one who makes too much in business" , "Make too much money" , "One making excessive gains from trading" , "insider trader?" , "Gain unfairly" .)

I've seen this clue in The Times.
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