Crossword Genius

Reluctant trustee initially making one cross (8)

Ross

I believe the answer is:

traverse

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'one cross' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for traverse that I've seen before include "Travel across or pass over" , "cover" , "In mountaineering, a steep slope to be crossed from side to side" , "Move across" , "Cross sideways" .)

I've seen this clue in The Times and The Sunday Times.
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