Spike fizzy drink when back on land in the Caribbean (8)
I believe the answer is:
barbados
'in the caribbean' is the definition.
(I've seen this before)
'spike fizzy drink' is the wordplay.
'spike' becomes 'barb' (I've seen this before).
'fizzy drink' becomes 'ados' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'barb'+'ados'='BARBADOS'
'when back on land' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for barbados that I've seen before include "Absorb ad about the West Indian island" , "Popular resort in the West Indies" , "Bridgetown is its capital city" , "Independent state in the West Indies" , "holiday island" .)