Posted an order to headquarters (6)

I believe the answer is:

depots

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'to headquarters' is the definition.
I can't tell whether this definition defines the answer.

'posted an order' is the wordplay.
'an order' indicates anagramming the letters.
'posted' with letters rearranged gives 'DEPOTS'.

Can you help me to learn more?

(Other definitions for depots that I've seen before include "Storage places" , "Stations where passengers or goods are unloaded" , "HQs" .)

I've seen this clue in The Globe and Mail.

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