Clear out, getting rid of small stuff (4)
I believe the answer is:
cram
'stuff' is the definition.
(I know this)
'clear out getting rid of small' is the wordplay.
'clear out' means to remove the middle letters (I've seen 'cleared out' mean this).
'getting' becomes 'collar' (collar is a kind of getting).
'rid of small' becomes 'am' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'collar' with its centre taken out is 'cr'.
'cr'+'am'='CRAM'
Can you help me to learn more?
(Other definitions for cram that I've seen before include "Stuff full" , "Greedily eat" , "Press together" , "prepare for exam" , "Pack in or study hard" .)