I put in spirit after water in tank (8)
I believe the answer is:
aquarium
'tank' is the definition.
(aquarium is a kind of tank)
'i put in spirit after water' is the wordplay.
'put in' means one lot of letters goes inside another.
'spirit' becomes 'rum' (alcoholic spirit).
'after' is a charade indicator (letters next to each other).
'water' becomes 'aqua' (I've seen this in another clue).
'i' inserted into 'rum' is 'rium'.
'rium' put after 'aqua' is 'AQUARIUM'.
'in' acts as a link.
(Other definitions for aquarium that I've seen before include "Glass fish-tank" , "Glass tank for fish" , "Tank for aquatic life" , "Building containing live fish for display" , "Fish-viewing tank" .)