A lot's served up for tea (5)
I believe the answer is:
assam
'tea' is the definition.
(I've seen this before)
'a lot's served up' is the wordplay.
'lot' becomes 'mass' ('mass' can be a synonym of 'lot'**).
'served up' is a reversal indicator.
'mass' backwards is 'ssam'.
'a'+'ssam'='ASSAM'
'for' is the link.
(Other definitions for assam that I've seen before include "Indian state, famed for its tea" , "part of India" , "State in northeastern India" , "Indian state known for its tea production" , "place associated with tea" .)