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 defines the answer.

'in central axminster' is the wordplay.
'in' indicates a hidden word.
'LAX' can be found hidden inside 'central axminster'.

'be' is the 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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