I drag back one tree (6)

I believe the answer is:

illupi

'tree' is the definition.
(type of tree)

'i drag back one' is the wordplay.
'drag' becomes 'pull' (synonyms).
'back' says the letters should be written backwards.
'one' becomes 'i' (Roman numeral).
'pull' backwards is 'llup'.
'i'+'llup'+'i'='ILLUPI'

(Another definition for illupi that I've seen is " Oil producer".)

I've seen this clue in The Independent.

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