Observation about trick over small storage area (11)
I believe the answer is:
compartment
'storage area' is the definition.
'compartment' can be an answer for 'area' (compartment is a kind of area). I'm not sure about the 'storage' bit.
'observation about trick over small' is the wordplay.
'observation' becomes 'comment' (I've seen this before).
'about' indicates putting letters inside.
'trick over small' becomes 'part' (I can't explain this - if you can you should give a lot more credence to this answer).
'comment' going around 'part' is 'COMPARTMENT'.
Can you help me to learn more?
(Other definitions for compartment that I've seen before include "part of carriage" , "Divide into separate sections" , "Separate division" , "Separated section" , "one of many coach may have" .)