This man is inclined to drink a port completely (4,4,5)
I believe the answer is:
head over heels
'completely' is the definition.
(I've seen this before)
'this man is inclined to drink a port' is the wordplay.
I cannot quite see how this works, but
'man' could be 'ado' and 'ado' is present in the answer.
'port' could be 'l' (abbreviation for L - 'port' is 'left' on a boat) and 'l' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for head over heels that I've seen before include "Completely - turning as in a somersault" , "topsy-turvy" , "In great confusion (because of love?)" , "In disorderly haste" , "Tumbling posture" .)