Many a footsore guild in British Society (7)

I believe the answer is:

bunions

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'many a footsore' is the definition.
I can't tell whether this definition defines the answer.

'guild in british society' is the wordplay.
'guild' becomes 'union' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'british' becomes 'b' (abbreviation e.g. in BBC).
'society' becomes 's' (common abbreviation in names of organisations).
'b'+'s'='bs'
'union' inserted inside 'bs' is 'BUNIONS'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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