Gratuities regularly shunned; at a push, Everyman will chip in (4)

I believe the answer is:

tips

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'gratuities' is the definition.
('tip' can be a synonym of 'gratuity')

I cannot understand how the remainder of the clue works.

(Other definitions for tips that I've seen before include "Useful hints" , "Ends" , "Hints or gratuities" , "Gratuties" , "extra payments" .)

I've seen this clue in The Everyman puzzle in The Observer.

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