Jog naked around back of building (5)
I believe the answer is:
nudge
'jog' is the definition.
(thesaurus)
'naked around back of building' is the wordplay.
'naked' becomes 'nude' ('nude' can be a synonym of 'naked'**).
'around' means one lot of letters goes inside another.
'back of' says to take the final letters.
The final letter of 'building' is 'g'.
'nude' enclosing 'g' is 'NUDGE'.
(Other definitions for nudge that I've seen before include "Jostle" , "Push gently" , "Gentle prod" , "Gentle poke with elbow" , "Push with the elbow" .)