What you shouldn't be in central Axminster (3)

I believe the answer is:

lax

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'what you shouldn't' is the definition.
I can't tell whether this definition defines the answer.

'in central axminster' is the wordplay.
'in' says the answer is hidden in the clue.
'LAX' can be found hidden inside 'central axminster'.

'be' acts as a link.

Can you help me to learn more?

(Other definitions for lax that I've seen before include "Insufficiently strict" , "Loose, careless" , "Slack, loose" , "Not sufficiently careful" , "Flabby" .)

I've seen this clue in the Evening Standard.

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