Opening bridges mechanic has manufactured (5)

I believe the answer is:

chasm

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

'opening' is the definition.
(I know that chasm is a type of opening)

'bridges mechanic has manufactured' is the wordplay.
'CHASM' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for chasm that I've seen before include "Great divide" , "Wide gap" , "Abyss" , "Deep hole" , "Deep opening in the earth's surface" .)

I've seen this clue in The Independent.

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