Was Ayrton brought up in Lytham St Annes? (5)

I believe the answer is:

senna

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'was ayrton brought up' is the definition.
I can't tell whether this definition defines the answer.

'lytham st annes?' is the wordplay.
'annes' can be anagrammed to 'SENNA'.
However, I'm not clear how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for senna that I've seen before include "He drove fast" , "Tropical plant with medicinal leaflets" , "taking this to speed up motion?" , "Medicinal plant - racing driver, Ayrton" , "Champion driver.once" .)

I've seen this clue in the Evening Standard.

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