Tea service close to grandma getting knocked over (5)
I believe the answer is:
assam
'tea' is the definition.
(I've seen this before)
'service close to grandma getting knocked over' is the wordplay.
'service' becomes 'mass' (I've seen this in other clues).
'close to' suggests the final letters (the close/ending of).
'getting knocked over' shows that the letters should be reversed in order.
The final letter of 'grandma' is 'a'.
'mass'+'a'='massa'
'massa' back-to-front is 'ASSAM'.
(Other definitions for assam that I've seen before include "Indian tea-producing region" , "Tea state of India" , "region out east" , "Leaves to get in hot water" , "Indian state known for its tea production" .)