It's up to Mike, little man (3)

I believe the answer is:

tim

(Other definitions for tim that I've seen before include "Tiny Dickens boy from 'A Christmas Carol'" , "-- Brooke-Taylor, comedian; -- Minchin, comedian" , "Sir -- Rice, lyricist" , "Tiny ..., Bob Cratchit's son in A Christmas Carol" , "Little fellow" .)

I've seen this clue in the Evening Standard.

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