Smallest animal in a litter (4)

I believe the answer is:

runt

'smallest animal in a litter' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for runt that I've seen before include "little one" , "Littlest oinker" , "Small pig" , "Smallest piglet of a litter" , "Undersized pig" .)

I've seen this clue in the Irish Times (Simplex) and The Times.

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