Mother accepting of poetry? A little (7)
I believe the answer is:
modicum
'a little' is the definition.
(I've seen this before)
'mother accepting of poetry?' is the wordplay.
'mother' becomes 'mum' (informal term for mother).
'accepting' indicates putting letters inside.
'of poetry?' becomes 'odic' (adjective meaning relation to an ode).
'mum' enclosing 'odic' is 'MODICUM'.
(Other definitions for modicum that I've seen before include "dash" , "A small amount as of drink" , "touch" , "I cod Mum into providing a small quantity" , "Little bit" .)