Dogs used by Speke (5)

I believe the answer is:

pekes

I'm a little stuck... Click here to teach me more about this clue!

'dogs' is the definition.
(Peke is an example)

'by speke' is the wordplay.
'speke' anagrams to 'PEKES'.
But, I am not clear how the anagram is indicated.

'used' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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