Whip may see little weight attached to Tory regularly absent (7)
I believe the answer is:
trounce
'whip' is the definition.
(synonyms)
'little weight attached to tory regularly absent' is the wordplay.
'little weight' becomes 'ounce' (unit of weight).
'attached to' says to put letters next to each other.
'regularly absent' means one should take alternating letters (letters removed at regular intervals).
The alternating letters of 'tory' are 'tr'.
'ounce' put after 'tr' is 'TROUNCE'.
'may see' acts as a link.
(Other definitions for trounce that I've seen before include "Thoroughly defeat" , "Defeat by large margin" , "Beat thoroughly on recount" , "Rout" , "Slaughter" .)