Building site worker tramples rare orchid (3,7)

I believe the answer is:

hod carrier

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'building site worker' is the definition.
'hod carrier' can be an answer for 'worker' (hod carrier is a kind of worker). I'm not sure about the 'building site' bit.

'tramples rare orchid' is the wordplay.
'rare orchid' can be anagrammed to 'HOD CARRIER'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Another definition for hod carrier that I've seen is " Bricklayer's labourer".)

I've seen this clue in The Guardian.

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