Useful, extremely, to have bits of advice about flowers (6)

I believe the answer is:

tulips

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'flowers' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for tulips that I've seen before include "Slit up the Spring flowers" , "Garden flowers - tip-toe through them in song" , "plants" , "Garden flowers associated with Amsterdam" , "Flowering bulbs" .)

I've seen this clue in The Times.

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