Jog in one's birthday suit, just about midnight (5)
I believe the answer is:
nudge
'jog' is the definition.
(I know that jog is a kind of nudge)
'in one's birthday suit just about midnight' is the wordplay.
I cannot really see how this works, but
'midnight' could be 'g' (the middle letter in 'night') and 'g' is found within the answer.
'in one's birthday suit' could be 'nude' (I've seen this in another clue) and 'nude' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nudge that I've seen before include "Jogger" , "Festive entertainment" , "Gently encourage" , "Slight push" , "Jostle" .)