Shave top of dining room furniture after dimensions were shown to be quite large (8)
I believe the answer is:
sizeable
'to be quite large' is the definition.
(I've seen this in another clue)
'shave top of dining room furniture after' is the wordplay.
'shave' becomes 'size' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'top of' means to remove the first letter (I've seen 'top' mean this).
'dining room furniture' becomes 'table' (I've seen this in another clue).
'after' says to put letters next to each other.
'table' with its first letter taken away is 'able'.
'size'+'able'='SIZEABLE'
'dimensions were shown' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for sizeable that I've seen before include "Large" , "Largish" .)