Oof I tire partly holding back drink (8)
I believe the answer is:
aperitif
'drink' is the definition.
(aperitif is a kind of drink)
'oof i tire partly holding back' is the wordplay.
'holding' indicates the answer is hidden within the clue.
'back' says the letters should be written in reverse.
'fitirepa' is hidden in the letters of 'oof i tire partly'.
'fitirepa' written backwards gives 'APERITIF'.
(Other definitions for aperitif that I've seen before include "Pre-dinner drink" , "Preliminary drink" , "Appetising drink" , "Alcoholic beverage as an appetiser" , "alcohol before meal" .)