Jostle the Spanish crook (5)
I believe the answer is:
elbow
'jostle' is the definition.
(I know that elbow is a kind of jostle)
'the spanish crook' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'crook' becomes 'bow'.
'el'+'bow'='ELBOW'
(Other definitions for elbow that I've seen before include "Nudge" , "Dismissal?" , "Jostle" , "Hinged joint" , "given to one about to leave" .)