Beneath umbrella, some hitch a ride (5)

I believe the answer is:

thumb

'hitch a ride' is the definition.
(thesaurus)

'beneath umbrella some' is the wordplay.
'some' says the answer is hidden in the clue.
'THUMB' can be found hidden inside 'beneath umbrella'.

(Other definitions for thumb that I've seen before include "Hitch ride" , "Tom's digital fairy tale" , "Hitchhike - ..... a lift" , "Tom ___ , traditional hero of English folklore" , "Pollex, in humans" .)

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

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