Courteous chaps and son stick to seedy establishment (10,4)

'seedy establishment' is the definition.
The definition suggests a singular noun which matches the answer.

'courteous chaps and son stick' is the wordplay.
I cannot quite understand how this works, but
'chaps' could be 'men' (chap can mean a man) and 'men' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
'son' could be 's' (genealogical abbreviation for son) and 's' is present in the answer.
'stick' could be 'club' (club is a kind of stick) and 'club' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'to' is the link.

Can you help me to learn more?