Crossword Genius

Bar serving others, though only to an extent (5)

Ross

I believe the answer is:

ingot

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Independent.
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