Fish on estate, perhaps, getting floral decoration (7)
I believe the answer is:
garland
'decoration' is the definition.
(garland is a kind of decoration)
'fish on estate' is the wordplay.
'fish' becomes 'gar' (gar is a kind of fish).
'on' is a charade indicator (letters next to each other).
'estate' becomes 'land' (synonyms).
'gar'+'land'='GARLAND'
'perhaps getting floral' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for garland that I've seen before include "Circle of flowers" , "Festoon of flowers" , "US actress and singer" , "one who played Dorothy" , "Judy - - , legendary singer" .)