Crossword Genius

Jostle small fish (5)

Ross

I believe the answer is:

shake

'jostle' is the definition.
(thesaurus)

'small fish' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fish' becomes 'hake' (type of fish).
's'+'hake'='SHAKE'

(Other definitions for shake that I've seen before include "Judder" , "Rattle" , "Quiver" , "Shiver" , "Jolt or agitate" .)

I've seen this clue in The Mirror.
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