Have a keen interest in, you understand (6)

I believe the answer is:

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This could be a double definition.

'have a keen interest in you' is the first definition.
'follow' can be an answer for 'have' (thesaurus). I am unsure of the 'a keen interest in you' bit.

'understand' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for follow that I've seen before include "Go or come after" , "'____ and don't dilly-dally on the way'" , "Chase" , "Ensue" , "Go behind" .)

I've seen this clue in the Evening Standard.

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