Wool provided by farmer in Otago (6)
I believe the answer is:
merino
'wool' is the definition.
(I've seen this before)
'provided by farmer in otago' is the wordplay.
'provided by' indicates a hidden word (the answer is provided within the clue).
'MERINO' is hidden in the letters of 'farmer in otago'.
(Other definitions for merino that I've seen before include "Spanish breed of sheep with high quality fleece" , "Breed of sheep with fine wool" , "Can this sheep be found in Rome?" , "Sheep with fine quality fleece" , "Long-haired sheep" .)