Little 7 is poorly accommodated in a loft conversion (8)
I believe the answer is:
flotilla
'little 7 is poorly' is the definition.
I can't tell whether this definition defines the answer.
'accommodated in a loft conversion' is the wordplay.
'accommodated' becomes 'ill' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'conversion' indicates an anagram.
'a'+'loft'='aloft'
'aloft' anagrammed gives 'flota'.
'ill' put into 'flota' is 'FLOTILLA'.
Can you help me to learn more?
(Other definitions for flotilla that I've seen before include "Group of boats or small warships" , "set of vessels" , "Fleet of small ships" , "number of vessels" , "collection of vessels" .)