Leader in the advertisement (4)

I believe the answer is:

head

'leader' is the definition.
(head is a kind of leader)

'in the advertisement' is the wordplay.
'in' indicates the answer is hidden within the clue.
'HEAD' can be found hidden inside 'the advertisement'.

(Other definitions for head that I've seen before include "Froth on beer" , "John on board" , "Leader; front" , "Leader; stream source" , "Chief; bonce" .)

I've seen this clue in the Sydney Morning Herald.

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