In 1999 I will move tree a short distance (10)

I believe the answer is:

millimetre

'a short distance' is the definition.

'in 1999 i will move tree' is the wordplay.
'in' indicates putting letters inside.
'1999' becomes 'mim' (Roman numerals).
'i will' becomes 'ill' (I've seen this before).
'move' is an anagram indicator (I've seen 'moved' mean this).
'mim' going around 'ill' is 'millim'.
'tree' with letters rearranged gives 'etre'.
'millim'+'etre'='MILLIMETRE'

I've seen this clue in The Guardian.

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