Crossword Genius

Inconsiderate thing for Billingsgate trader to do, it’s said (7)

Ross

I believe the answer is:

selfish

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'inconsiderate' is the definition.
('selfish' is associated in meaning with 'inconsiderate')

I cannot understand how the remainder of the clue works.

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(Other definitions for selfish that I've seen before include "Concerned only with one's personal welfare" , "for personal gain" , "Concerned only with no. 1" , "Putting own interests first" , "Egocentric - greedy" .)

I've seen this clue in The Times.
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