Flowery trade union mouthpiece! (5)
I believe the answer is:
tulip
'flowery trade' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'union mouthpiece' is the wordplay.
'union' becomes 'tu' (abbreviation for trade union).
'mouthpiece' becomes 'lip' (part of the mouth).
'tu'+'lip'='TULIP'
Can you help me to learn more?
(Other definitions for tulip that I've seen before include "Liliaceous plant with a spring flower" , "Pretty flower, musically from Amsterdam" , "Spring-blooming plant" , "cause of mania once" , "Bulb producing a single showy flower" .)