I really drink and like some drinks (8)
I believe the answer is:
isotonic
'like some drinks' is the definition.
(type of drink taken after exercise)
'i really drink' is the wordplay.
'really' becomes 'so' (both can mean 'extremely').
'drink' becomes 'tonic' (tonic is a kind of drink).
'i'+'so'+'tonic'='ISOTONIC'
'and' acts as a link.
(Other definitions for isotonic that I've seen before include "as energy drinks might be" , "Type of drink restoring body fluids and salts" , "at the same pressure?" , "drink sold at the leisure centre" , "Powerade, say" .)