Crossword Genius

Trustworthy type — one's been fired? (5)

Ross

I believe the answer is:

brick

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'trustworthy type' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for brick that I've seen before include "Clay building block" , "Rectangular block for building" , "dropped?" , "Good guy" , "Building material" .)

I've seen this clue in The Times.
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