Ignoble - HQ (4)

I believe the answer is:

base

I believe this is a double definition.

'ignoble' is the first definition.
(similar in meaning)

'hq' is the second definition.
(HQ is headquarters)

(Other definitions for base that I've seen before include "Foot; ignoble" , "Plinth" , "Foundation; counterfeit" , "floor" , "Bottom support" .)

I've seen this clue in The Guardian.

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