Egg on some burgers (4)

I believe the answer is:

urge

'egg on' is the definition.
(to egg on is to urge or encourage)

'some burgers' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'URGE' can be found hidden inside 'burgers'.

(Other definitions for urge that I've seen before include "Compulsion; egg on" , "Strongly encourage" , "Advise strongly or prod" , "Yen" , "Encourage (to do something)" .)

I've seen this clue in The Sun and The Times.

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