Dig exposed borders on original garden (5)
I believe the answer is:
nudge
'dig' is the definition.
(thesaurus)
'exposed borders on original garden' is the wordplay.
'exposed borders' becomes 'nude' (I am not sure about this - if you are sure you should believe this answer much more).
'on' indicates putting letters inside (as in clothing 'on' a person).
'original' suggests taking the first letters.
The first letter of 'garden' is 'g'.
'nude' going around 'g' is 'NUDGE'.
Can you help me to learn more?
(Other definitions for nudge that I've seen before include "Prod gently with elbow" , "Gentle poke with elbow" , "Push (with a wink?)" , "Elbow someone gently" , "Jostle" .)