Bar serving others, though only to an extent (5)
I believe the answer is:
ingot
'bar' is the definition.
(block of metal, eg a bar of gold)
'serving others though only to an extent' is the wordplay.
'INGOT' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for ingot that I've seen before include "Lump of gold etc" , "expensive block" , "A brick shaped lump of gold" , "Moulded metal bar" , "Piece of cast metal" .)