Leaving nothing out with poor actor's material (7)
I believe the answer is:
gingham
'material' is the definition.
(gingham is a kind of material)
'leaving nothing out with poor actor's' is the wordplay.
'leaving nothing out' becomes 'ging' (I am not sure about this - if you are sure you should believe this answer much more).
'with' means one lot of letters go next to another.
'poor actor' becomes 'ham' (I've seen this before).
'ging'+'ham'='GINGHAM'
Can you help me to learn more?
(Other definitions for gingham that I've seen before include "Lightweight cotton fabric" , "Cotton cloth woven with coloured checks" , "Light cotton checked fabric" , "Cotton cloth, maybe checked" , "Fabric in a plaid weave" .)