A mark we all have (4)

I believe the answer is:

weal

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'a mark' is the definition.
(I've seen this before)

'we all have' is the wordplay.
'all have' becomes 'al' (I can't explain this - if you can you should give a lot more credence to this answer).
'we'+'al'='WEAL'

Can you help me to learn more?

(Other definitions for weal that I've seen before include "Mark of wound - welfare" , "Raised mark of blow" , "Red mark on skin" , "Mark of blow; wellbeing" , "Red swollen mark" .)

I've seen this clue in the Evening Standard.

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