Favourite name for a botanical part (5)

I believe the answer is:

petal

I'm a little stuck... Click here to teach me more about this clue!

'botanical part' is the definition.
'petal' can be an answer for 'part' (I have seen 'Part of flower' mean 'petal' so perhaps 'part' could also mean 'petal'). I am unsure of the 'botanical' bit.

'favourite name' is the wordplay.
'favourite' becomes 'pet' (synonyms).
'name' becomes 'al' ().
'pet'+'al'='PETAL'

'for a' is the link.

Can you help me to learn more?

(Other definitions for petal that I've seen before include "Bloom's part" , "Brightly-coloured part of flower" , "Flower part seen on plate" , "Flowery term of endearment?" , "Plate (anag.)" .)

I've seen this clue in the Evening Standard.

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