Dog leaps in excitement (7)

I believe the answer is:

spaniel

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'dog' is the definition.
(spaniel is a kind of dog)

'leaps in excitement' is the wordplay.
'leaps in' anagrams to 'SPANIEL'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for spaniel that I've seen before include "Dog found among the alpines" , "Springer- - -" , "Dog with long silky coat" , "[HOUND]" , "Type of dog" .)

I've seen this clue in The Mirror.

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