Describes dairy supplier, after the start, looking sheepish? (5)

I believe the answer is:

ovine

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'sheepish?' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for ovine that I've seen before include "1/6 = 2/3 of 28 [SHEEPISH" , "Sheep-like" , "like a mug" , "Resembling a sheep" , "Like the Cheviots" .)

I've seen this clue in The Irish Times.

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