Crossword Genius

Rolling barrel contains Mike Walker (7)

Ross

I believe the answer is:

rambler

'walker' is the definition.
(I know that rambler is a type of walker)

'rolling barrel contains mike' is the wordplay.
'rolling' indicates an anagram.
'contains' indicates putting letters inside.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'barrel' with letters rearranged gives 'rabler'.
'rabler' enclosing 'm' is 'RAMBLER'.

(Other definitions for rambler that I've seen before include "Straggling rose" , "Person who takes long walks in the country" , "Rose - that goes for country walks?" , "One who goes on country walks" , "country activist" .)

I've seen this clue in The Sun.
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