Bar from keeping otters (5)
I believe the answer is:
ingot
'bar' is the definition.
(block of metal, eg a bar of gold)
'from keeping otters' is the wordplay.
'from' says the answer is hidden in the clue.
'INGOT' is hidden within 'keeping otters'.
(Other definitions for ingot that I've seen before include "Moulded metal bar" , "Block of precious metal" , "A lump of metal like gold" , "Unwrought metal cast in a mould" , "Metal casting" .)