One may do so after a trip, annually (4)

I believe the answer is:

fall

I'm a little stuck... Click here to teach me more about this clue!

'trip annually' is the definition.
'fall' can be an answer for 'trip' (trip can mean to fall over). I am not certain of the 'annually' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fall that I've seen before include "Autumn in Vermont?" , "Quarrel" , "Drop - sin" , "Trip over - flag" , "Autumn; plummet" .)

I've seen this clue in the Evening Standard.

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