Sent a mass of tea (5)
I believe the answer is:
assam
'tea' is the definition.
(I've seen this before)
'sent a mass' is the wordplay.
'sent' indicates an anagram (send can mean to excite or stimulate).
'a'+'mass'='amass'
'amass' anagrammed gives 'ASSAM'.
'of' acts as a link.
(Other definitions for assam that I've seen before include "Tea-growing state in north-east India" , "State of NE India" , "I'll provide lots of tea" , "region out east" , "Kind of Indian tea" .)