Liliaceous plant in yacht manoeuvring by hotel (8)
I believe the answer is:
hyacinth
'liliaceous plant' is the definition.
(hyacinth is a kind of liliaceous plant)
'in yacht manoeuvring by hotel' is the wordplay.
'manoeuvring' indicates anagramming the letters.
'by' says to put letters next to each other.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'in'+'yacht'='inyacht'
'inyacht' anagrammed gives 'hyacint'.
'hyacint'+'h'='HYACINTH'
(Other definitions for hyacinth that I've seen before include "Flower, in an achy hint" , "Bulbous house plant" , "Spring flower" , "Fragrant bulb" , "Fragrantly-flowered bulb" .)