Crossword Genius

Barker's timeshare rarely used (8,7)

Ross

I believe the answer is:

sealyham terrier

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'barker's' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'timeshare rarely used' is the wordplay.
'used' is an anagram indicator.
'timeshare'+'rarely'='timesharerarely'
'timesharerarely' anagrammed gives 'SEALYHAM TERRIER'.

Can you help me to learn more?

(Another definition for sealyham terrier that I've seen is " Dog".)

I've seen this clue in The Guardian.
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