Beat to mash, mostly - satisfied? (8)
I believe the answer is:
pulsated
'beat' is the definition.
(I've seen this before)
'mash mostly satisfied?' is the wordplay.
'mash' becomes 'pulp' (pulping is a kind of mashing).
'mostly' means to remove the last letter.
'satisfied?' becomes 'sated' (I've seen this before).
'pulp' with its final letter taken away is 'pul'.
'pul'+'sated'='PULSATED'
'to' is the link.
(Other definitions for pulsated that I've seen before include "Beat" , "Throbbed, expanded and contracted rhythmically" , "Thrilled" .)