Bet on yield varying as instructed (10)

I believe the answer is:

obediently

'as instructed' is the definition.
(obeying instructions)

'bet on yield varying' is the wordplay.
'varying' indicates an anagram.
'bet'+'on'+'yield'='betonyield'
'betonyield' anagrammed gives 'OBEDIENTLY'.

I've seen this clue in The Telegraph.

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