In extremities they can be accommodating (4)
I believe the answer is:
inns
'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).
'in'+'ns'='INNS'
'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" .)