A suggestion of an elbow (5)
I believe the answer is:
nudge
This clue is a double definition.
'a suggestion' is the first definition.
(thesaurus)
'an elbow' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for nudge that I've seen before include "Remind (with the elbow?)" , "Gentle prod" , "Push (with a wink?)" , "Festive entertainment" , "Encouraging prompt" .)