Union insolence — it arises in spring (5)

I believe the answer is:

tulip

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'it arises in spring' is the definition.
The definition suggests a singular noun which matches the answer.

'union insolence' is the wordplay.
'union' becomes 'tu' (abbreviation for trade union).
'insolence' becomes 'lip' (I've seen this before).
'tu'+'lip'='TULIP'

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(Other definitions for tulip that I've seen before include "Bulbous plant" , "It blooms in 11 down" , "Spring bulb" , "Bulb producing a single showy flower" , "Spring-flowering bulb" .)

I've seen this clue in The Times.

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