Tea service available, initially wheeled round (5)
I believe the answer is:
assam
'tea' is the definition.
(I've seen this before)
'service available initially wheeled round' is the wordplay.
'initially' indicates taking the first letters.
'wheeled' is a reversal indicator (letters are wheeled back).
'round' becomes 'sam' (I can't explain this - if you can you should give a lot more credence to this answer).
The initial letters of 'service available' is 'sa'.
'sa' back-to-front is 'as'.
'as'+'sam'='ASSAM'
Can you help me to learn more?
(Other definitions for assam that I've seen before include "I'll provide lots of tea" , "India tea-producing state" , "source of tea?" , "State in northeastern India" , "part of India" .)