Crossword Genius

The loaf to use sensibly (4)

Ross

I believe the answer is:

head

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'the loaf' is the definition.
(I've seen this in other clues)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for head that I've seen before include "bean" , "John on board" , "Source of river, leader" , "Skull" , "Person in charge" .)

I've seen this clue in the Evening Standard.
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