Useless line again entertains old comedian (6,5)

I believe the answer is:

dudley moore

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'comedian' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'useless line again entertains old' is the wordplay.
'useless' becomes 'dud' (dud can mean faulty or failing).
'line' becomes 'ley' (as in ley lines).
'again' becomes 'more' (I've seen this in another clue).
'entertains' means one lot of letters goes inside another.
'old' becomes 'o' (abbreviation).
'more' going around 'o' is 'moore'.
'dud'+'ley'+'moore'='DUDLEY MOORE'

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I've seen this clue in The Times.

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