Stock ending for rude joke (5)
I believe the answer is:
equip
'stock ending' is the definition.
'equip' can be an answer for 'stock' (thesaurus). I am not sure about the 'ending' bit.
'rude joke' is the wordplay.
'rude' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'joke' becomes 'quip' (a quip is a joke or witticism).
'e'+'quip'='EQUIP'
'for' is the link.
Can you help me to learn more?
(Other definitions for equip that I've seen before include "Provide with requirements" , "Give what's needed" , "Provide stuff" , "Accoutre" , "Furnish with requirements" .)