Small class, without room to display little creature in fine case (8)
I believe the answer is:
silkworm
'creature in fine case' is the definition.
'silkworm' can be an answer for 'creature' (silkworm is a kind of animal). I am unsure of the 'in fine case' bit.
'small class without room to display little' is the wordplay.
I cannot really see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is found within the answer.
'class' could be 'ilk' (both can mean a type or variety) and 'ilk' is present in the answer.
'without' could be 'wo' (abbreviation of 'without', normally with a slash) and 'wo' is found in the answer.
'room' could be 'rm' (I've seen this in other clues) and 'rm' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for silkworm that I've seen before include "Caterpillar yielding fine fibre" , "It feeds on mulberry leaves" , "It feeds on the 24" .)