Crossword Genius

Endlessly bad-tempered old comedian (7)

Ross

I believe the answer is:

groucho

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'comedian' is the definition.
(I know that Groucho is a comedian)

'endlessly bad-tempered old' is the wordplay.
'endlessly bad-tempered' becomes 'grouch' (I can't explain this - if you can you should give a lot more credence to this answer).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'grouch'+'o'='GROUCHO'

Can you help me to learn more?

(Other definitions for groucho that I've seen before include "One of Marx Brothers" , "A Marx; a club" , "One of Harpo's brothers" , "One of four comedian brothers" , "The Marx Brother with the moustache" .)

I've seen this clue in The Times.
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