Be behind, you understand (6)

I believe the answer is:

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This clue might be a double definition.

'be behind' is the first definition.
'follow' can be an answer for 'be' (following is a kind of being). I'm not sure about the 'behind' bit.

'understand' is the second definition.
(thesaurus)

'you' is the link.

Can you help me to learn more?

(Other definitions for follow that I've seen before include "Pursue or understand" , "Trail" , "Go behind" , "Go along (a route)" , "'____ and don't dilly-dally on the way'" .)

I've seen this clue in the Evening Standard.

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