Crossword Genius

One giving endless pleasure as a pet? (4,3)

Ross

I believe the answer is:

manx cat

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'one giving endless pleasure' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'as a pet?' is the wordplay.
'as' becomes 'manx' (I am not sure about this - if you are sure you should believe this answer much more).
'a pet?' becomes 'cat' (I've seen this in other clues).
'manx'+'cat'='MANX CAT'

Can you help me to learn more?

(Other definitions for manx cat that I've seen before include "Tailless pet" , "Tailless feline breed" , "Short-tailed feline" , "Tail-less feline from Isle of Man" , "Tailless moggy" .)

I've seen this clue in the Evening Standard.
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