Little space to be engrossed in accommodating a venture (9)
I believe the answer is:
endeavour
'venture' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'little space to be engrossed in accommodating a' is the wordplay.
'little space' becomes 'en' (in printing, a space as wide as a letter 'n').
'to be engrossed' becomes 'devour' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in accommodating' is an insertion indicator.
'devour' enclosing 'a' is 'deavour'.
'en'+'deavour'='ENDEAVOUR'
Can you help me to learn more?
(Other definitions for endeavour that I've seen before include "Make a serious effort" , "Try to achieve something" , "famous ship" , "Try - Captain Cook's vessel" , "Determined attempt" .)