Bound to drink around the end of week (4)
I believe the answer is:
skip
'bound' is the definition.
(thesaurus)
'drink around the end of week' is the wordplay.
'drink' becomes 'sip' (I've seen this before**).
'around' indicates putting letters inside.
'the end of' indicates one should take the final letters.
The last letter of 'week' is 'k'.
'sip' placed around 'k' is 'SKIP'.
'to' is the link.
(Other definitions for skip that I've seen before include "Intentionally fail to attend" , "Jump lightly over; refuse container" , "Omit - play with rope" , "Hop, omit" , "light bouncing step" .)