Airmen from Berkshire? (4)

I believe the answer is:

erks

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

'airmen' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'from berkshire?' is the wordplay.
'from' indicates a hidden word.
'ERKS' is hidden in the letters of 'berkshire'.

Can you help me to learn more?

(Other definitions for erks that I've seen before include "fliers" , "personnel in forces" , "chaps in forces" , "Aircraftmen" .)

I've seen this clue in the Evening Standard.

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