Tiny character, only three-tenths of a centimetre (3)

I believe the answer is:

tim

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'tiny character only three-tenths' is the definition.
I can't judge whether this defines the answer.

'of a centimetre' is the wordplay.
'of' indicates a hidden word.
'TIM' is hidden in the letters of 'centimetre'.

Can you help me to learn more?

(Other definitions for tim that I've seen before include "-- Brooke-Taylor, comic" , "Sir -- Rice, lyricist" , "Tiny . . . is a loveable boy in fiction" , "Tiny ..., Bob Cratchit's son in A Christmas Carol" , "Tiny . . . is a loveable Dickens boy" .)

I've seen this clue in the Evening Standard.

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