Removing unwanted plants, little, before sound of bell (7)

'removing' is the definition.
(weeding is a kind of removing)

'unwanted plants little before sound of bell' is the wordplay.
'unwanted plants' becomes 'weeds' (I've seen this before).
'little' means to remove the last letter (the word is not quite complete).
'before sound of bell' becomes 'ing' (I can't explain this - if you can you should give a lot more credence to this answer).
'weeds' with its final letter taken away is 'weed'.
'weed'+'ing'='WEEDING'

Can you help me to learn more?