Friend following leaders in London obstinately, yet in a faithful manner (7)

I believe the answer is:

loyally

'in a faithful manner' is the definition.
(to be faithful is to be loyal)

'friend following leaders in london obstinately yet' is the wordplay.
'friend' becomes 'ally' (synonyms).
'following' means one lot of letters go next to another.
'leaders in' suggests taking the first letters.
The initial letters of 'london obstinately yet' is 'loy'.
'ally' after 'loy' is 'LOYALLY'.

(Another definition for loyally that I've seen is " Faithfully".)

I've seen this clue in The Telegraph.

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