Turkey's weight to beat (7)
I believe the answer is:
trounce
'beat' is the definition.
(trouncing is a kind of beating)
'turkey's weight' is the wordplay.
'turkey' becomes 'tr' (I've seen this in other clues).
'weight' becomes 'ounce' (ounce is a kind of weight**).
'tr'+'ounce'='TROUNCE'
'to' is the link.
(Other definitions for trounce that I've seen before include "Hammer" , "Beat heavily" , "National flower of South Africa" , "Roundly defeat" , "summons" .)