Happen to be getting the drop on (6)

I believe the answer is:

befall

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'happen to' is the definition.
(synonyms)

'be getting the drop on' is the wordplay.
'getting the drop on' becomes 'fall' (I am not sure about this - if you are sure you should believe this answer much more).
'be'+'fall'='BEFALL'

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(Other definitions for befall that I've seen before include "Turn out" , "Happen to (someone)" , "Happen, occur" .)

I've seen this clue in the Evening Standard.

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