Crossword Genius

A slight shake of the head in it will reveal something (4,1,5)

Ross

I believe the answer is:

shed a light

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'something' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'a slight shake of the head in it' is the wordplay.
'shake of' indicates anagramming the letters (I've seen 'shakes' mean this).
'in it' means one lot of letters goes inside another.
'head' is an anagram of 'heda'.
'slight' placed around 'heda' is 'SHED A LIGHT'.

'will reveal' acts as a link.

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I've seen this clue in the Evening Standard.
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