Crossword Genius

A person of habit, male running kilometres (4)

Ross

I believe the answer is:

monk

'a person of habit' is the definition.
(a monk's robe is called a habit)

'male running kilometres' is the wordplay.
'male' becomes 'm' (common abbreviation).
'running' becomes 'on' (eg when a machine is running it is on).
'kilometres' becomes 'k'.
'm'+'on'+'k'='MONK'

(Other definitions for monk that I've seen before include "Male member of religious order" , "One vowed" , "Thelonious - - (jazz)" , "Friar" , "prayer?" .)

I've seen this clue in The Times.
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