Scottish team in English county, by the sound of it? (6)

I believe the answer is:

hearts

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'scottish team' is the definition.
(nickname of Heart of Midlothian FC)

'in english county by the sound of it?' is the wordplay.
'in' means one lot of letters goes inside another.
'english county' becomes 'herts' (abbreviation for Hertfordshire).
'by the sound of it?' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'herts' placed around 'a' is 'HEARTS'.

Can you help me to learn more?

(Other definitions for hearts that I've seen before include "Edinburgh football team - suit" , "They beat" , "Central parts" , "Playing card suit" , "Card suits in bodies" .)

I've seen this clue in The Telegraph.

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