Flowers and fish found next to dock (7)
I believe the answer is:
'flowers' is the definition.
(I've seen this before)
'fish found next to dock' is the wordplay.
'fish' becomes 'gar' (type of gar).
'found next to' says to put letters next to each other.
'dock' becomes 'land' (both can mean to arrive on dry land).
'and' is the link.
(Other definitions for garland that I've seen before include "Wreath of flowers" , "Wreath - for Judy?" , "Circular band of flowers" , "one who played Dorothy" , "US actress and singer" .)