Poor accommodation of boy, timid little thing keeping quiet (9)
I believe the answer is:
almshouse
'poor accommodation' is the definition.
(historical type of accommodation for the poor)
'boy timid little thing keeping quiet' is the wordplay.
'boy' becomes 'Al'.
'timid little thing' becomes 'mouse' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'keeping' is an insertion indicator (some letters kept inside).
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'mouse' going around 'sh' is 'mshouse'.
'al'+'mshouse'='ALMSHOUSE'
'of' is the link.
Can you help me to learn more?
(Other definitions for almshouse that I've seen before include "dwelling for an old woman?" , "home for the poor" , "home for the needy" , "Endowed lodging for the poor" , "Shelter charitably provided" .)