Followed in the most fussy detail (6)

I believe the answer is:

tailed

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'followed' is the definition.
(I've seen this in another clue)

'the most fussy detail' is the wordplay.
'detail' can be anagrammed to 'TAILED'.
But, I'm not clear how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for tailed that I've seen before include "Followed, tracked" , "Followed (suspect)" , "In slang, followed like private detective" , "Dogged" , "Followed informally in detail" .)

I've seen this clue in the Evening Standard.

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