In extremities they can be accommodating (4)
I believe the answer is:
'be accommodating' is the definition.
I can't tell whether this defines the answer.
'in extremities they' is the wordplay.
'extremities they' becomes 'ns' (I can't justify this - if you can you should believe this answer much more).
'can' is the link.
Can you help me to learn more?
(Other definitions for inns that I've seen before include "More than one pub" , "King's ..., for the legal eagles" , "Places of rest and sustenance for travellers" , "travellers' accommodation" , "Country taverns" .)