Crossword Genius

Most half-hearted moving around, but he keeps rolling (3,6,6)

Ross

I believe the answer is:

old father thames

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'most half-hearted moving around but he keeps rolling' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'most half-hearted moving around but he keeps rolling' is the wordplay.
'most half-hearted' anagrams to 'OLD FATHER THAMES'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Times.
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