Sheep from old Ireland Maureen keeps (6)
I believe the answer is:
merino
'sheep' is the definition.
(breed of sheep)
'old ireland maureen keeps' is the wordplay.
'old ireland' becomes 'erin' (I've seen this before).
'maureen' becomes 'Mo' (short for Maureen).
'keeps' indicates putting letters inside (inserted letters are kept inside).
'erin' placed into 'mo' is 'MERINO'.
'from' acts as a link.
(Other definitions for merino that I've seen before include "Sheep bred for its long, fine wool" , "Fine-wool sheep" , "Fine woollen yarn" , "Sheep with fine quality fleece" , "The sheep provides fine wool" .)